United Kingdom, April 16 -- Christie Brinkley experienced the "worst kind of loneliness" towards the end of her relationship with Billy Joel.

The 71-year-old model divorced the 'Piano Man' singer after nine years of marriage in 1994 and has explained that Billy's drinking meant she had to end the relationship against her wishes.

Writing in her new memoir 'Uptown Girl', which is being serialised by People magazine, Christie said: "To be clear. I never wanted to end things with Billy. But his drinking was bigger than the both of us.

"In the end, when the relationship isn't functioning the way you want it to be anymore - that's the worst kind of loneliness because you just can't make it work together and that's painful."

Christie famousl...