Ryan Reynolds Celebrates Birthday With Blake Lively

Today is Ryan Reynolds' 35th birthday.

He's had a very special guest to help him celebrate: Actress Blake Lively! The Green Lantern co-stars – and their dogs – were spotted Saturday morning outside an apartment in Boston, where he's filming the action film, R.I.P.D.:

The Gossip Girl star was incognito, but there's no hiding her dog Penny!

And this is no casual birthday meet-up. It's at least the third time Blake Lively and Ryan Reynolds have been spotted in Beantown within the last month.

"They are very much a couple," a source says. "They're really happy together."

Lively, 24 recently split from Leonardo DiCaprio after a fairly serious romance, and Reynolds is still friendly with his former wife, Scarlett Johansson.

Happy birthday, Ryan! And congrats on the new relationship, guys!

[Photo: Pacific Coast News]