It was fun while it lasted!

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Gossip Girl's Chace Crawford has moved out of the NYC apartment he shares with costar Ed Westwick, a source tells exclusively.

The two have shared the apartment in the Chelsea neighborhood since they both first moved to the city after being cast in the hit CW series.

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The source says Crawford -- who will star in the upcoming reboot of Footloose -- moved out on Monday and into a rented penthouse apartment in the luxe Dwell 95 building in NYC's Financial District.

The reason for Crawford's change of scenery?

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Apparently, Westwick is a slob, and Crawford couldn't take the mess any longer, a source tells Us.