Aimee Osbourne (search), the eldest daughter of Ozzy and Sharon Osbourne, is now having treatment in Los Angeles after a lump was removed from her breast, Sharon Osbourne said Wednesday.

"Aimee's had a breast cancer scare. She found a lump on her breast which she's had removed," Sharon Osbourne said in a statement without saying whether the lump was cancerous or providing other details.

Sharon and Aimee had been set to star in a London production of "The Vagina Monologues" (search) but withdrew Friday, saying Aimee was ailing.

"The operation went very well on the whole but there have been a few minor complications and she will be having more treatment and lots of rest over the next few weeks," Sharon Osbourne said. "We're sure she'll make a complete recovery."

Aimee, 21, was the only family member not to appear in the MTV reality show, "The Osbournes," (search) that catapulted the family to fame.