Gossip Girl's Leighton Meester is at war with her mother Constance for spending money Leighton sent for her brother. Leighton would send her mom $7,500/ month to care for her brother Alexander, but Constance would allegedly spend the funds on cosmetic procedures and other expenses, her suit alleges.

A source said: "This whole thing's been really tough on Leighton. Her only concern has always been taking care of her brother. Leighton's really close with her brother and her dad – her parents are divorced.."

- I deleted the portion of the quote that said Leighton's a sweet girl who cares about her family and friends because that's just a PR spin because the chick's suing her own mother.

Leighton says that her mother threatened to sue her for $3 million if she didn't raise the monthly allowance to $10,000.

Constance has filed a counter-suit claiming that Leighton has broken financial promises. "Leighton intentionally assaulted Constance by throwing her to the ground and repeatedly hitting her with a bottle," the legal papers say.

Leighton's mom claims that there is no money "to feed and care for Alexander" now that Leighton has breached their agreement. Sad! XOXO, Gossip Girl.