Elizabeth Taylor's heart operation went "perfectly".

The Oscar-winning actress underwent surgery to repair a leaky heart valve earlier this week, and has taken to her Twitter page to reassure fans she is recovering well.

She wrote: "Dear Friends, My heart procedure went off perfectly. It's like having a brand new ticker. Thank you for your prayers and good wishes... I know they all helped. Love you, Elizabeth (sic)."

Elizabeth had the operation in Los Angeles, but the exact medical centre is unknown.

The 77-year-old star announced she was checking into hospital on Twitter, asking her fans to pray for her quick recovery.

She wrote: "Dear friends, I would like to let you know before it gets in the papers that I am going into the hospital to have a procedure on my heart.

"It's very new and involves repairing my leaky valve using a clip device, without open heart surgery, so that my heart will function better.

"Any prayers you happen to have lying around I would dearly appreciate. I'll let you know when it's all over. Love you, Elizabeth."

The Hollywood legend battles several health problems, and regularly appears in a wheelchair when she is in public.