Credit: twitter.com

Ashton Kutcher celebrated his 34th birthday in a big way Tuesday -- with a giant cake in his likeness!

To get the party started, Kutcher's Two and a Half Men coworkers gifted him with a sheet cake featuring a promo image of the actor alongside series costars Jon Cryer and Angus T. Jones.

"I love my coworkers," Kutcher -- whose ex, Demi Moore, spent his birthday in rehab -- tweeted Tuesday afternoon.

Kutcher -- who appears on the primetime comedy as Walden Schmidt -- appears to be fitting in just fine in the five months since his September debut.

"He jokes with the crew, has no tantrums, he comes in well studied in his lines -- it's such a nice change," a crew member told Us Weekly of Kutcher, who replaced Charlie Sheen after the network fired him in March 2011. "So far there have been no issues and everyone is really happy with how it's working out. Nobody is missing Charlie right now."