From the look of those abs, it seems that Justin Bieber has indeed grown up! The “Boyfriend” singer was photographed in his birthday suit (well, his top half at least) and some super low slung pants after a show in Birmingham, England on the night of February 28th on his way back to the hotel for a quick wardrobe change. Looking fresh in his evening wear, a Nets hat, baggy leather pants and a beige cardigan, the Biebs then hit London-town, welcoming in the 1st by clubbing until the wee hours of the morning with friends, and of course, some pretty ladies (including the mystery blonde, identified as Natasha Jane Beech, who partied with the birthday boy earlier this week too). Celebrations are set to continue tonight with a circus-themed bash. Manager Scooter Braun, who gifted the teen his Fisker Karma car last year, is making it all happen at London hotspot, Cirque Du Soir. If you really want there to be one, or let’s say, six, less lonely girls tonight, Biebs, we here at Glam will be waiting for our invites. Until then, happy 19th!

image via Huffington Post UK