Rihanna Wears Pajama-Inspired Outfit To Barclays Center 40/40 Club Grand Opening Party (VIDEO, PHOTOS)

Last night Jay-Z feted the Grand opening of his 40/40 Club at the new Barclays Center in Brooklyn with a VIP party for all his fancy friends. Questlove, J. Cole, Adrienne Bailon, Tika Sumpter and Tyson Beckford were just a handful of the stars that turned out to toast the new digs.

Roc Nation superstar Rihanna also showed up for the festivities, even though it looked like she rolled right out of bed. The "Diamonds" singer wore a pajama-inspired printed silk blouse and pants from Acne's Resort 2013 collection. She opted for a bold red lip and nude Manolo Blahnik sandals, which helped elevate the look.

RiRi's a bona fide fashion risk taker, so it's no surprise she turned heads in this latest getup. However, this isn't the first we've seen the singer step out in sleepwear-inspired threads--she wore a similar look at the Japan premiere of "Battleship" back in April. And she's not alone in this trend--Rachel Roy, Selma Hayek and more have been spotted in their jammies as well.

Check out a few pics of Rihanna at the 40/40 opening--and a look at her journey to becoming a style star in the slideshow below.