Leighton Meester and mom suing one another

"Gossip Girl" star Leighton Meester has filed a lawsuit against her mother Constance, claiming that her mother is using the $7,500 Leighton sends home monthly for cosmetic procedures instead of health care for her youngest brother Alexander, who has medical issues. According to the suit, (obtained by E!) Leighton's mother allegedly refuses to work and is using the money for Botox, plastic surgery and hair extensions.

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Meanwhile, Constance Meester on Monday filed a lawsuit in Los Angeles County Superior Court alleging that Leighton promised her a one-time payment of $30,000, and then $10,000 a month, and hasn't paid. As a result, there's not sufficient funds for Alexander's care. But there's more: Constance's lawsuit claims that "at 2:00 a.m. on December 11, 2010, Leighton intentionally assaulted Constance by throwing her to the ground and repeatedly hitting her with a bottle. Leighton had to be pulled off of Constance by her brother Alexander."

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Constance asks for damages from the alleged beating, for breach of contract, fraud, intentional infliction of emotional distress and other charges.

"This whole thing's been really tough on Leighton," a source told People. "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. Leighton's a sweet girl -- she cares about work, friends and family."