Maggie Gyllenhaal points to her diamond-encrusted watch saying “my daughter wears this” during the launch party for Piaget’s Paris-New York collection held at The Loft and Garden at Rockefeller Center in NYC.

Meanwhile, newly engaged Mena Suvari dashes between the inside party and the outside garden to show off her rock to pals Emmy Rossum and Zoe Kravitz, saying “It’s from my boyfriend – now my fiancé.”

Liv Tyler is in good spirits, shaking hands and smiling when she elevators into the soiree. A reporter asks, “How do you keep your teeth so white?,” which she calls “the most embarrassing question ever!”

Gossip Girl’s Leighton Meester greets me with “hi, how are you?” while she is chilling by the pool outside. This is just the first event on her sked tonight. “I’m actually going to see the Police right now,” she says.

Here’s Emmy, who attended NYC’s posh Spence School. Was it anything like Gossip Girl? “Yes, but with less testosterone,” she tells me. “I don’t think there was as many tables at Butter or as many Prada handbags, but probably close.” (Get this — she’s allergic to toothpaste!)

Ugly Betty’s Becki Newton is thrilled with the show’s move to the Big Apple.

“It’s going great,” she tells me. “It’s so nice to be shooting in New York City, especially when we’re outside. We’re so, so happy to be here.”

She calls Rebeccca Romijn a “happy, warm person. She’s going to be a great mom.”

What’s Becki’s fashion mantra?

“Try to have fun and not worry too much,” she says. “I don’t like to limit myself. One minute I’m obsessed with color, and then today I’m all in black. There really are no rules. I just try everything.”

Pick up the OK! on newsstands now for more coverage of Piaget’s Paris-New York collection. “Britney Tells All About Her Boys And Her New Life” is the cover line.

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