Not because she won’t jump into bed with anyone hot and famous – just ask Leonardo DiCaprio. Or don’t, according to Miller.

Simply because theactress doesn’t wear pants. She prefers the look of granny underwear, the easier for new man candy, Diddy, to yank off before Kim Porter catches him.

Perhaps Isaac Cohen needs to purchase some panties for Sienna, as well, seeing her apparent taste in undergarments. No wonder Jude Law cheated on her with the nanny.

The Red Hot Chili Peppers tied the Brazillian bombshell with seven noms for their song, “Dani California.” It will go up against the hips of Shakira, “Ain’t No Other Man” by Christina Aguilera, Madonna’s “Hung Up” and Panic! At The Disco’s “I Write Sins Not Tragedies” for video of the year.

Other categories and award battles include:

• Shakira and Aguilera are also in the running for best female video. They’ll face off against Kelly Clarkson (“Because of You”), Nelly Furtado (“Promiscuous”) and Madonna — whose “Hung Up” is also in the running for best dance video, best pop video and best choreography.
• Best male video nominations are: Nick Lachey for “What’s Left of Me,” James Blunt’s “You’re Beautiful,” Kanye West’s “Gold Digger” (the new, official ballad of Heather Mills), T.I.’s “What You Know” and Busta Rhymes’s “Touch It Remix.”
• Best group video contenders are the Chili Peppers, Panic! At the Disco, the All-American Rejects (“Move Along”), Fall Out Boy (“Dance, Dance”) and Gnarls Barkley (“Crazy”).

The MTV Awards will air live at 8 p.m. ET on Aug. 31. Tune in to see performances by Beyonce, Justin Timberlake, Panic! At The Disco, the Killers and rappers T.I. and Ludacris.