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Bradley Cooper arrived at the Los Angeles County Museum of Art Thursday night with friend Kate Hudson, but he left the event with another A-list actress, girlfriend Zoe Saldana!

The LACMA event was held for the first installment of Jason Reitman's Live Read ...and it was Shampoo, a movie that originally starred Kate's mom, Goldie Hawn. Kate must have been proud.

At 8:30am, Brad's girlfriend, Zoe, arrived solo and parked her Audi directly in front of her beau's ride.

Three hours later, Brad and his mom left in his Mercedes SUV ... and Zoe could be seen leaving right in front of them.

As for Ms. Hudson, she got a ride home with hubby Matt Bellamy. What a night!