Mike Tyson helps Rosie O'Donnell ring in her birthday

Mike Tyson keeps popping up in the weirdest places and it seems like he'll do anything to make a buck or keep his tattooed face in the public eye.

Monday night, the former heavyweight champion, helped Rosie O'Donnell celebrate her 50th birthday  with some of his family, her fiancee Michelle Rounds, staff  and fifty assorted women turning 50 who were invited to party with the star.

Rosie had a good time at a Chicago lounge, despite recently getting the news that her talk show on the OWN network was being cancelled.

Tyson had taped an episode of the show earlier in the day and is promoting his upcoming one-man show in Las Vegas.

Maybe he stumbled into the bash thinking the guest of honor was Chuck Wepner with a little make-up.

The ear-biting fighter rolled out the 3-foot birthday cake while dancing to 50 cent's "In Da Club" and led everyone in a rendition of "Happy Birthday."

Rosie jumped on stage and sang with the band Sixteen Candles in their version of "Jessie's Girl."

The show's final broadcast will be March 30, but Rosie told everyone to have a positive outlook despite the  cancellation.