Allison Williams owes much of her success to Lena Dunham, the creator of Girls.

But now that she’s set to star in NBC’s Peter Pan Live! this December, the actress who plays Marnie wants out of the hit HBO show.

“Allison is telling friends that season four will be her last, but she hasn’t come clean to Lena yet,” says an insider.

But why does she want to leave Girls?

Pick up the latest issue of OK! magazine, on stands now, to find out.

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