Blake Lively Giggles on 'Gossip Girl' Set

Blake Lively gets the giggles while on the set of Gossip Girl on Thursday (September 1) in New York City.

The actress, who recently celebrated her 24th birthday, was in a great mood as she worked on set. Blake is back in town after taking a trip to Australia!

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While down under, Blake spent time with rumored beau Leonardo DiCaprio and visited a wildlife park, where she got up close and personal with wild animals!

10+ pictures inside of Blake Lively on the set of Gossip Girl…