Cameron Diaz and Leonardo DiCaprio at the Rosewood; Taylor Swift Hits Cookshop

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"Wait, you wrote a song about me already?" Photo: Tom Meinelt / Splash News

With Oscar season upon us, A-Listers hit the town in droves. Anne Hathaway and her Les Misérables co-stars partied at Porter House New York, Cameron Diaz met up with Leonardo DiCaprio at the opening of the Rosewood, and Taylor Swift continued to fuel dating rumors at Cookshop. It's time once again for our weekly roundup of celebrity sightings.

Cookshop: Taylor Swift and Harry Styles brought their budding romance to Chelsea during lunch on Tuesday. The musical couple spent the night before in Taylor's downtown hotel room and will both perform at Z100's Jingle Ball on Friday. [NYDN]

Da Silvano: Sharon Stone took a break from filming Fading Gigilo to lunch on some Scottish langoustines at the West Village Italian restaurant. [Page Six/NYP]

Finale: Heidi Klum finally got the chance to wow guests as Cleopatra at her postponed Halloween party on Saturday. Amar’e Stoudemire and fiancée Alexis Welch went as Beauty and the Beast; Katie Couric wore a box of eggs on her head; Jay Manuel dressed as a furry devil; and Mickey Rourke went as himself, which was maybe enough of a costume for the first night of December. [Page Six/NYP]

Fresco by Scotto: Randy Jackson joined Rosanna Scotto, Hoda Kotb and friends for dinner at Scotto's family-owned restaurant Saturday night. [Page Six/NYP]

Le Cirque: Daphne Guinness and boyfriend Bernard Henri-Levy dined together at the upscale French restaurant. [Page Six/NYP]

The Lion: Katy Perry and Cameron Diaz ate separately at the West Village hotspot this week. [Page Six / NYP, NYDN]

Loi: Frances McDormand helped pick up the pieces when a tray of hors d'oeuvres spilled in front of her at the after-party for her new movie Promised Land. She got down on her hands and knees to clear away glass and even went as far as to retrieve napkins from the kitchen to prevent other guests from slipping. [NYDN]

Patsy's: Michael Buble met Dean Martin's daughter, Deana, at the Italian restaurant. [Page Six/NYP]

Pig and Khao: Derek Jeter pigged out on chef Leah Cohen's Sizzling Sisig, a dish made of pig's head and liver. The injured Yankees shortstop called the Filipino delicacy "a game changer." [Page Six/NYP]

Porter House New York: Amanda Seyfried celebrated her birthday with her Les Misérables co-stars on Sunday. She was presented with a cake and a brief lap dance from Hugh Jackman at the Peggy Siegal Company party that followed a screening of the film. [Page Six/NYP]

Rosewood: Leonardo DiCaprio, Cameron Diaz, and Miranda Kerr were among the first visitors to the club's opening on Friday, where models danced on banquettes, and sipped Champagne and Belvedere. Amanda Bynes checked out the new space on Tuesday around 1 a.m. The former Nickelodeon star danced alone, though looked a bit lost, and moved on after about an hour. [Page Six/NYP]

SL: Amanda Bynes showed up at the Chelsea club after leaving Rosewood. Alone still, she asked another clubgoer if she could take a picture of her outfit. The girl asked for a picture of Amanda in return, but Bynes claimed that wasn't herself and said "no photos." [Page Six/NYP]