March 1 (today) is Justin Bieber’s birthday and he was photographed shirtless heading to his hotel room after performing in Birmingham, England. I gotta hand to the Pisces guy – he has been working hard at the gym because his body is looking good. This is/was his 19th birthday and is said to have been planning a circus-themed birthday party.

I have to confess I’m hyperaware of which celebrities have their birthdays today because it is also my birthday. Thirty-two years ago I was born in a hospital and the following day, my parents who had arranged to adopt me came and picked me up… so now I like to celebrate the 2nd as well.

Anyway, check out which other celebrities in addition to Justin Bieber are celebrating their birthdays today. One of them came out with a new album a few months ago and the other guys are just hot. Oh, and Bieber’s shirtless photo is after the jump too.

Justin Bieber shirtless on his birthday, heading to his hotel room.

Ke$ha turns 26 today.

Supernatural‘s Jensen Ackles turns 35 today.

Saved By The Bell hunk, Mark-Paul Gosselaar turns 39 today.

Other Celebrity Birthdays Today: Javier Bardem (44), Ron Howard (59), Tim Daly (57), Alan Thicke (66)