The photobomb culprit is on the loose again!
After receiving an unexpected visit from longtime pals Rande Gerber and Cindy Crawford for his birthday weekend in London, actor George Clooney couldn’t help but sneak into the couple’s sweet snapshot documenting their trip across the pond.
Clooney — a repeat photobomb offender — mugged it up in the image taken aboard a riverboat ride that took place on Sunday and shared by Crawford.
Wrote the model, “We can always count on him for the photobomb.”
“They flew to London to surprise George for his birthday over the weekend,” a source tells PEOPLE of the couple.
Another insider added that the duo flew in on Friday and left on Monday.
Clooney celebrated his 56th birthday on Saturday, and his Casamigos tequila business partner Gerber turned 55 in late April.
Part of the celebrations included a meal at a pub and a cake from Clooney’s expectant wife Amal Clooney “replicating the Casamigos tequila bar from their houses in Mexico,” the insider shares.
“Amal set it all up and made it a joint birthday celebration since Rande’s birthday was just a couple of weeks ago,” explains the source.
Gerber and Clooney posed with the confectionary creation for a photo shared to Gerber’s Instagram.
Both men emulated their cake mini-mes’ poses before cutting into the dessert.
RELATED VIDEO: He’s ‘Excited but Nervous!’ How George Clooney Is Getting Ready to Be a Dad to Twins
Wrote Gerber, “Celebrating our Birthdays @casamigos style. Thanks for the cool cake Amal. #houseoffriends.”