Cityfile: New York's Most Notable and Influential

• Donny Deutsch has been caught fooling around with a married woman. Or at least that's what hedge fund manager Andrew Sandler claims, who hired a private detective to follow his wife Lisa around and eventually scored pics of the two of them making out. [P6]
• Jennifer Aniston appears naked on the cover of the new GQ, and in the accompanying article she says her relationship with Brad Pitt and Angelina Jolie is like an "insane Bermuda Triangle." Meanwhile, Brad admits to the new Rolling Stone that he fell in love with Angie while he was still married to Jen. [NYP, Daily Mail]
• Rachel Zoe's rep says the only reason she's been looking so thin lately is because she "just got over the stomach flu." Right. [OK!]More

♦ Mary-Kate Olsen was "acting very oddly" during her stay in Miami for Art Basel. After getting into a fight with Kirsten Dunst at a party at the Delano on Wednesday night, MK—who "looked like she had not brushed her hair in a week"—spent the weekend drinking, chain-smoking, and hanging out with boyfriend Nate Lowman, which means she's probably not pregnant. [P6, P6]
♦ Lindsay Lohan went to a party for Milk without Samantha Ronson last week, where she was spotted nuzzling with Sean Penn. [Fox 411]
♦ Amy Winehouse's husband Blake Fielder-Civil is reportedly threatening to write a tell-all book about Winehouse unless she gives him $1.7 million in the divorce settlement. [NYP]
More