Ryan Reynolds Spends Birthday Weekend with Blake Lively

Blake Lively and Ryan Reynolds

Sam Sharma/Pacific Coast News

updated 10/22/2011 AT 5:00 PM ET

originally published 10/22/2011 AT 6:30 PM ET

Happy birthday to Ryan Reynolds!

The actor, who turns 35 on Sunday, is celebrating this weekend with someone special: Blake Lively.

The Green Lantern costars – and their dogs – were spotted Saturday morning outside an apartment in Boston, where he’s filming the action film, R.I.P.D.

And this is no casual birthday meet-up. “They are very much a couple,” a source tells PEOPLE. “They’re really happy together.”


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