Frank Sinatra will spin in his grave over this one: Sean "Puffy" Combs says his romance with Jennifer Lopez had all the torrid qualities of the affair between Ol' Blue Eyes and Ava Gardner.

"I'm Frank, you know what I'm saying?" Combs tells the June issue of Vanity Fair. 

"Frank's gonna always love Ava, and Ava's gonna always love Frank, and everybody's just gotta deal with it. 

"We'd always say to each other that I was Frank and she was Ava, you know what I'm saying? Everything being always up and down. 

"Or Joe DiMaggio and Marilyn Monroe. Sometimes, when two people get together, you feel a certain type of spark that's like, 'Yo!'" 

Combs, 31, and Lopez, 30, broke up earlier this year, and Jennifer quickly jumped into a hot-and-heavy romance with hunky dancer Cris Judd, who has appeared in her videos. 

But Puffy, who says he's changing his nickname from Puff Daddy to P. Diddy, insists he's still mad about Latina bombshell J-Lo. 

And he insists he would lay his life on the line for her anytime. 

"She'll always be someone that I love. All she's gotta do is think - she doesn't even need to pick up the phone - and I'll be able to feel her," he says. 

"Even in her darkest hour, if she's in a building and there's a fire, and somebody's gotta run in, and there's a 99 percent, 100 percent chance that they'll die, I'll run in there after her." 

Despite their breakup, Lopez describes how she stuck by Puffy during his weapons-and-bribery trial in connection with the December 1999 shooting at Club New York. A jury acquitted him in March. 

"I just tried to be there for him. I tried to stay positive, even when I didn't feel positive. And I was always a phone call away," she tells Vanity Fair. 

Lopez also critiques her film career, calling her 1993 TV flick Nurses on the Line: The Crash of Flight 7 the "s- - - -iest movie-of-the-week you ever saw . . . And I sucked in it, by the way, I sucked

"But you know what? The day I got that part, I still remember. I still remember how happy I was, and I still remember how much I made." 

And the feisty actress-singer says that only one star has ever intimidated her: serial skirt-chaser Jack Nicholson, with whom she starred in the 1997 thriller Blood & Wine