By Grady Smith
July 26, 2011 at 09:25 PM EDT

On July 20, Constance Meester, the mother of Gossip Girl star Leighton Meester, filed suit against her daughter. The suit comes just days after Constance was sued by Leighton for allegedly misusing funds the actress was sending for the medical support of her brother, Alexander.

Constance, Leighton’s former manager, claims that she and Leighton entered into a verbal contract during a legal settlement in 2009 in which Leighton agreed to pay her mother a one-time fee of $30,000 and then $10,000 every month for the rest of her life. The mother alleges that Leighton only paid $20,000 in the beginning, followed by sporadic monthly payments of $7,500, and that she breached their settlement when she canceled Constance’s health insurance and ceased sending payment in early July. Now, Constance wants $3 million from the actress.

Constance Meester’s papers go on to reveal that she has Hepatitis C, and that the medicine to treat the illness costs $5,000 per month. Other costs include Alexander’s tuition, set at $30,000 a year. The papers further claim that Leighton assaulted Constance by “throwing her to the ground and repeatedly hitting her with a bottle,” in December 2010, and that she attempted to convince her brother, Alexander, to abandon his mother and move to New York. When he couldn’t make the move, Leighton cut off support for her mother and brother, Constance claims.

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‘Gossip Girl’ star Leighton Meester sues mother