On Friday, the Friends star, 55, shared the photo -- which shows her rocking a bikini and the soccer star, 44, donning swim trunks -- with the caption, "Too hot in the hot tub! #modernfamily,"
A second photo had the pair joined by Modern Family actors Jesse Tyler Ferguson and Eric Stonestreet, while eagle-eyed followers deemed Cox putting her hand on Beckham's leg inappropriate as they are both in serious relationships.
And fans of "Friends" had a blast with the images as one posted, "Chandler is like wtffff," as another echoed the sentiment writing, "I cannot believe you're cheating Chandler like that I thought he's the only man who you took a shower with!"
TooFab can't wait to see what's in store for the "Modern Family" episode featuring Cox and Beckham!