Justin Bieber Flirts at Victoria's Secret Fashion Show, Buddies Up to British Model Cara Delevingne, Should Selena Gomez be Worried?

Justin Bieber performed at the 2012 Victoria's Secret Fashion Show on Wednesday (Nov. 7) alongside Rihanna and Bruno Mars - following the annual event the teen heartthrob got his flirt on with many of the gorgeous Angels models at the exclusive nightclub after party, with girlfriend Selena Gomez nowhere in sight! Sources confirm that the Biebs was "innocently" flirting and having a great time, and ended up spending a majority of the evening buddying up to beautiful British model Cara Delevingne. The duo are just friends, and 20-year-old Delevingne simply referred to their hangout as "sweet" - but even so, should Gomez be worried about her boyfriend's wandering eyes?

Bieber hit the runaway with the stunning Victoria's Secret models to perform his hits "Beauty and the Beat" and "As Long as You Love Me" (the show will be broadcasted on CBS in December). Following the event, 18-year-old Bieber joined many of the Angles at an exclusive after party at Avenue, and then continued festivities at the popular Manhattan nightclub Lavo. Apparently, the Biebs was having an awesome time, hanging out with a number of model beauties including Miranda Kerr and Lily Aldridge. An inside source tells Page Six, "He was hitting on the girls all day... He was asking for their numbers."

Most of the flirting was most likely fun and innocent - many of the Victoria's Secret beauties are much older than Bieber (most already married with children). But some heads began to turn once Bieber struck up a friendly convo with young (and single) British model Cara Delevingne (who might have a thing for teen pop megastars, rumors have it she once dated One Direction heartthrob Harry Styles). Onlookers confirm that the "Boyfriend" singer spent a lot of time with Delevingne throughout the evening (who was decked out in a sexy, short, tight black dress).  At one point in the evening, Delevingne even strutted up to Bieber's table at Lavo to continue their friendly chat. The British socialite then posted this image on Twitter, with the simple caption, "@Caradelevingne: "At the @VictoriasSecret show with @justinbieber! So sweet!":

As stated before, Gomez was nowhere in sight, but then again she's also quite busy in her career at-the-moment. So what do Mstarz fans think, does Gomez have anything to worry about? Such flirting may have been completely innocent - Bieber is a young man who was surrounded by a bunch of stunning models, who could blame him for having some fun with it? At the same time, Delevingne seems to have her eye out on the Biebs...