By Kelly Schremph, Hollywood.com Staff

Justin Bieber isn't a kid any longer and he's going to great lengths to prove it to us. In a preview for his music video ""Boyfriend"" — which is scheduled to be released in full at 7:50 p.m. ET on Thursday — we see the Biebs grinding up against yet another Selena Gomez look-alike. (If you recall, we saw him canoodling with another beautiful brunette in his Christmas single ""Mistletoe"").

Bieber Fever is sure to come back in full force once girls get an eyeful of this provocative clip. Our little boy is growing up so fast.

Check out the 30-second sneak peek below and let your Bieber Fever fly:

Get More: Music News

More:

Justin Bieber Shows Off New Album Cover — PICS

Watch Justin Bieber Get Cozy in His 'Mistletoe' Music Video

Lady Gaga & Justin Bieber Outed as Aliens in Men in Black 3

[MTV]