Looks like life does imitate art as these GG and 90210 cast members are proving...

...as they date their fellow co-stars when the cameras stop rolling.

The Gossip Girl cast

Blake Lively (Serena van der Woodsen) and Penn Badgley (Dan Humphrey)

Let's hope Blake and Penn's off-screen relationship isn't anything like their on/off onscreen one!

Jessica Szohr (Vanessa Abrams) and Ed Westwick (Chuck Bass)

These two hooked up on Gossip Girl and are now dating in real life.

Leighton Meester (Blair Waldorf) and Sebatian Stan (Carter Baizen)

These two got together on the programme and are very much together in real life - sweet!

Click through to see which of the 90210 cast members are hooking up both on and off-screen...