Could the reason why Paulina Gretzky wears such tiny bikinis is because she (gasp!) doesn't know what size she is?
We're asking this question because Wayne Gretzky's daughter posted a new Instagram photo on Monday sporting a top that looks about two sizes too small for the lean singer-in-training.
Posing with fiancé Dustin Johnson in front of a beach at night, the leggy Maxim cover girl looked gorgeous, natch, in black leggings, a revealing long-sleeve top that showed off her toned tummy and a tan zip-up vest (no No. 99 tattoo to be seen!).
Looking tanned and well-rested, the 25-year-old is no doubt taking a break after filming a commercial for TaylorMade Golf and practicing her golf swing.
In between all this work and subsequent vacations, we hope the NHL heiress is finding time to plan her upcoming wedding, which is reportedly set for this fall. We can't wait to see her wedding dress!
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Paulina Gretzky follows the play of Dustin Johnson during the second round of The Barclays at Liberty National Golf Club on August 23, 2013 in Jersey City, New Jersey. (credit:Alex Trautwig/Getty Images)
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A close-up of Paulina Gretzky's engagement ring. (credit:djohnsonpga, Instagram)
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Paulina Gretzky and Dustin Johnson celebrate their engagement. (credit:paulinagretzky, Instagram)
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Paulina Gretzky and Dustin Johnson at Wayne Gretzky's in Toronto. (credit:Paulina Gretzky/Instagram)
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Paulina Gretzky And Janet Jones-Gretzky(58 of76)
The wife of Wayne Gretzky, Janet Jones sits with daughter Paulina for Game Three of the 2012 Stanley Cup Final between the Los Angeles Kings and the New Jersey Devils at the Staples Center on June 4, 2012 in Los Angeles, California. (credit:Dave Sandford/NHLI via Getty Images)
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Wayne Gretzky with wife Janet Jones at the 1989 NHL Awards. (Photo by Bruce Bennett Studios/Getty Images)
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Janet Jones during the 1989 Vira Awards at Ma Maison in Los Angeles, California, United States. (Photo by Ron Galella, Ltd./WireImage)
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Wayne Gretzky With Janet Jones With Their Kids At New Indiana Jones Adventure Ride in 1991. (Photo by Dave Benett/Getty Images)
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Janet Jones and Wayne Gretzky sit during the press conference for the announcement of Gretzky being traded to the Los Angeles Kings on August 9, 1988 at the Great Western Forum in Inglewood, California. (Photo by Getty Images) (credit:Getty Images)
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Janet Gretzky wife of Wayne Gretzky of the New York Rangers looks as he announces his retirement from professional hockey at a press conference at Madison Square Garden in New York City, New York, 1999. Mandatory Credit: Ezra Shaw/ALLSPORT (credit:Getty Images)
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Professional hockey great Wayne Gretzky and his wife Janet Jones-Gretzkyarrives at 'An Unforgettable Evening' presented by Saks Fifth Avenue benefitting Cedars-Sinai Medical Center March 27, 2001 at the Regent Beverly Wilshire Hotel in Beverly Hills, CA. (Photo by Chris Weeks/Liaison) (credit:Getty Images)
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Actress Janet Gretzky arrives at the Pre-Golden Globes DPA Gifting Lounge hosted by Nathalie Dubois held at the The Peninsula Hotel on January 9, 2009 in Beverly Hills, California. (Photo by Katy Winn/Getty Images) (credit:Getty Images)
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From L to R: Janet Jones, Emma Gretzky, Wayne Gretzky, Tristan Gretzky, Paulina Gretzky and Ty Gretzky arrives at Mr. Pink Ginseng Drink Launch Party on October 11, 2012 in Beverly Hills, California. (Photo by Valerie Macon/Getty Images) (credit:Getty Images)
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Hockey player Wayne Gretzky (R) and Janet Jones-Gretzky attend the 27th Annual Cedars-Sinai Medical Center Sports Spectacular at the Hyatt Regency Century Plaza hotel on May 20, 2012 in Century City, California. (Photo by Frederick M. Brown/Getty Images) (credit:Getty Images)
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Janet Jones-Gretzky hits a tee shot during ARIA Resort & Casino's Michael Jordan Celebrity Invitational golf tournament at Shadow Creek on April 6, 2013 in North Las Vegas, Nevada. (Photo by Isaac Brekken/Getty Images for Michael Jordan Celebrity Invitational) (credit:Getty Images)
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Former NHL player Wayne Gretzky, wife Janet Jones-Gretzky and their son Trevor Gretzky arrive at the 12th Annual Michael Jordan Celebrity Invitational Gala At ARIA Resort & Casino on April 5, 2013 in Las Vegas, Nevada. (Photo by Bryan Steffy/Getty Images for Michael Jordan Celebrity Invitational) (credit:Getty Images)
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National Hockey League Hall of Fame player Wayne Gretzky and his wife Janet Jones-Gretzky attend the 11th annual Michael Jordan Celebrity Invitational gala at the Aria Resort & Casino at CityCenter March 30, 2011 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for MJCI) (credit:Getty Images)
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Janet Jones-Gretzky and actor Brian Baumgartner attend the 11th annual Michael Jordan Celebrity Invitational gala at the Aria Resort & Casino at CityCenter March 30, 2011 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for MJCI) (credit:Getty Images)
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Actress Janet Jones-Gretzky poses for photos in the press room during the 2007 ESPY Awards at the Kodak Theatre on July 11, 2007 in Hollywood, California. (Photo by Frederick M. Brown/Getty Images) (credit:Getty Images)
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Actress Janet Jones atttends the world premiere of 'Dirty Deeds' at the Directors Guild of America on August 23, 2005 in Los Angeles, California. (Photo by Stephen Shugerman/Getty Images) (credit:Getty Images)
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Former hockey player Wayne Gretzky and wife Janet Gretzky pose at 'The David Beckham Academy' launch party at Creative Artists Agency on June 3, 2005 in Beverly Hills, California. The reception was a celebration in the partnership between sports and entertainment AEG and Beckham, which has established the Los Angeles and London locations of the David Beckham Academy. (Photo by Kevin Winter/Getty Images for AEG) (credit:Getty Images)
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Wayne Gretzky and wife Janet Jones at ESPN's 10th Annual Espy Awards at the Kodak Theatre in Hollywood, Ca. Wednesday, July 10, 2002. Photo by Kevin Winter/ImageDirect (credit:Getty Images)
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Hockey star Wayne Gretzky (R) and wife Janet Jones attend the premiere of the film 'Ocean's Eleven' December 5, 2001 in Los Angeles, CA. (Photo by Vince Bucci/Getty Images) (credit:Getty Images)