Justin Bieber tried very hard to hit on the bodacious babes of the Victoria’s Secret fashion show, flirting and asking the models for their numbers during filming and at the after-party, sources tell us.

Bieber, who is dating Selena Gomez, performed at the VS show at the Lexington Avenue Armory on Wednesday, and attended the after-party at Lavo on East 58th Street, where models including Karlie Kloss, Alessandra Ambrosio and Doutzen Kroes celebrated.

Bieber also popped up at Avenue later, where the teenage heartthrob was spotted at a table with his entourage and VS Angel Miranda Kerr.

According to several sources, Bieber was “asking for phone numbers from the girls” throughout taping of the show and at the party.

“He was hitting on the girls all day,” added one witness. “He was asking for their numbers.”

Bieber, 18, may have had limited success because some of the ladies are married with children and came to the party with their significant others, including VS angel Lily Aldridge, who just had a baby, Dixie, with her husband, Kings of Leon rocker Caleb Followill.

Lindsay Ellingson was there with her boyfriend, who was overheard telling her how amazing she looked and how proud he was. Jessica Hart, who walked in the show’s Pink collection, hung out with her longtime boyfriend Stavros Niarchos. And though Erin Heatherton is fresh from her breakup with Leonardo DiCaprio, she was “super happy” to hang out with her girlfriends. “She’s totally over Leo,” said a friend.

One VS model Bieber was able to strike up a friendship with was Cara Delevingne. The British beauty — who clearly has a thing for ’tween stars, having dated One Direction’s Harry Stylestweeted a photo of herself cuddling Bieber at the show, which airs on CBS on Dec 4.

And at Lavo, Delevingne was spotted climbing toward Bieber’s table to chat to the singer, maneuvering over a banquette in a sexy, short and tight black dress. A rep for Bieber declined to comment last night.