Posted on Thu Feb 25, 2010 06:45 AM PDT
William Baldwin palled around with Blake Lively on the set of Gossip Girl yesterday in New York, playing the part of Serena's long lost father.
Lively's character spent a large part of the season looking for her dad while her mom Lily (Kelly Rutherford) was secretly receiving letters from the missing man and hiding them from her daughter.
Baldwin's got some real-life drama of his own ... his wife Chynna Phillips checked into a rehab facility for anxiety just over a week ago not long after her sister Mackenzie went public with accusations their late father John sexually abused her.
Sometimes truth is stranger than fiction!
I hope Billy and Chynna's kids are okay! Dad's on the opposite coast and mom's away in rehab -- poor children!
SEE THE GALLERY Blake & Billy On the Set Of Gossip Girl