Christie Brinkley divorcing husband number four

Ex-model Christie Brinkley, 52, is divorcing hubby number four, architect Peter Cook.

The two were together for nearly 10 years, and have one child, a daughter.

According to Brinkley’s spokesperson, Elliot Mintz, the split was confirmed on Entertainment Tonight.

"Yes, it's true. The couple has separated. Christie's primary interest at this difficult time is for the protection of her children and (she) would be most appreciative if people would be good enough to respect her privacy."

The gorgeous blonde spokesperson for the “Total Gym” with Chuck Norris also had a part in National Lampoon's Vacation, teasing a hapless Chevy Chase.

Brinkley has two other children from her previous marriages, Alexa Ray, 20, and Jack, 11.

The Detroit native and vegetarian was once married to singer Billy Joel, and became his Uptown Girl muse, also appearing in the music video.