The *NSYNC star said he's always thought of Spears as a "little sister," but didn't know the two really had (distant) family ties until now.
"I can not express how much love I feel right now," wrote the *NSYNC star, who had previously spoken about his desire to become a father.
Supporters of Britney Spears and Janet Jackson offered up replacements for the annual rush of "It's gonna be May" memes.
The former bandmates took part in the Simple Plan/"I'm Just A Kid" trend, expertly using a pineapple as a stand-in for their friend.
In a recently unearthed 1999 interview, the actor admitted she wasn't a fan of the boy band.
Jimmy Fallon dug up an old video of Biel, which her husband, Justin Timberlake, might not be too happy about.
Nicki Minaj, Diddy and more also joined the singer onstage.
"Onstage, I felt like I was just playing a character, but offstage, unfortunately, I didn’t get to have my real life."