News See How Justin Bieber Celebrated His 21st Birthday By Rosalyn Oshmyansky 9:53 AM PST, March 1, 2015 Instagram Justin Bieber spent the night before his 21st birthday without a shirt.The singer is officially 21 on Sunday, and his pal Hailey Baldwin posted this snap with him looking pensive on Saturday.NEWS: Comedy Central Will Roast Justin BieberAnd he didn't put a shirt on with his former rumored romantic interest Yovanna Ventura either. Ventura shared this intimate moment. WATCH: Justin Bieber's First ET InterviewMore photos of Bieber were put together by the Shots photo-sharing platform for Bieber's big day so that fans could relieve some his best moments.Bieber also got in some social sharing as he tweeted about the milestone he reached after #HappyBirthdayJustinBieber trended. He said, "Grateful to be alive!! Love u!! 21" and "I love everybody! #21."To see more of Justin Bieber shirtless, check out his Calvin Klein ads in the video below.Justin Bieber's Calvin Klein Drama: Mark Wahlberg's Wife Weighs In as Un-retouched Pics Surface Related GalleryWhat Happened in Vegas?