The Congresswoman widow of SONNY BONO has been caught up in a lurid sex scandal now being investigated by the FBI! reports Congresswoman Mary Bono Mack has been caught on camera in a lurid scandal where another woman is apparently licking her breast.

The racy pic which shows the powerful politician in a playful, but compromising position with a campaign donor is now being investigated by the FBI.

Bono, 49, is a Republican lawmaker representing California’s 45th congressional district and sits on the Committee on Energy and Commerce.

She is the widow of Sonny Bono and has been in Congress since 1998.

The woman apparently licking Bono’s breast is Edra Blixseth, a disgraced former billionaire who is at the center of a criminal investigation probing whether she made fraudulent representations about her financial worth to a number of banks.

In a scandal set to rock Capitol Hill, the image was taken at an out-of-control event four-years-ago, at Blixseth’s $75 million Porcupine Creek estate in Rancho Mirage, California.

With her head thrown back, Bono’s plunging bra is exposed as Blixseth — who now dates Dallas actor Jack Scalia after splitting from her husband Tim in 2008 — is seen diving into the politician’s cleavage with her tongue out.

"Mary was partying hard," one source, who was at the event, said.

"She was blitzed and clearly having a great time."