"Entertainment Tonight" is reporting that Mary-Kate Olsen (search), one-half of the Olsen Twins, has been released from a treatment facility.

Michael Pagnotta, spokesman for Mary-Kate and Ashley Olsen, told "ET" this morning that Mary-Kate was discharged Friday night after six weeks at the treatment facility.

He says Mary-Kate was feeling very well and "is looking forward to rejoining her family and friends and preparing for her freshman year at New York University."

The 18-year-old actress has been reported to be battling an eating disorder.

Mary-Kate, and her blond twin sister, Ashley Olsen (search), turned 18 in June. They plan to attend New York University in the fall.

They've been acting together since they were 9 months old, most notably on the sitcom "Full House" and in a series of direct-to-video movies. They've also attached their names to a line of products ranging from clothing to beauty items to home decorating merchandise.

Their big-screen debut, "New York Minute," (search) did poorly at the box office after its May release.