Ryan Reynolds Smooches Blake Lively in a Bathing Suit

By Marla Lehner

07/08/2012 at 09:30 AM EDT

Ryan Reynolds and Blake Lively showed their love for each other during a PDA-filled party last week.

In a series of new photos from a Fourth of July bash, the couple are seen smiling, smooching, laughing – and playing in a dunk tank with Lively's family in New York.

In one steamy photo, Reynolds, 35, pulls Lively, 24, in close for a kiss while she wraps her arm around his neck and balances a drink in the other hand.

Lively wears a patriotic blue and white polka dot swimming suit, while Reynolds is pictured in a white tank top and khaki pants in some shots and in a pair of loose, blue swim trunks in others.

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Lively and Reynolds began dating last fall, and the couple seems to have settled into comfortable pattern of spending time together with their families. In May, they had a big family dinner in the actor's hometown of Vancouver.