With her platinum hair freshly curled, Gwyneth Paltrow looked pretty in pink (vintage couture) at Tuesday’s Hottest Pink Party Ever, the Breast Cancer Foundation’s annual spring gala.

But it wasn’t Paltrow’s first party of the night.

Earlier in the evening, the Oscar-winner threw a birthday bash for her son Moses, who turned two on Tuesday.

“It’s so exciting,” Paltrow gushed to PEOPLE at the event, held at New York City’s Waldorf-Astoria hotel. “We had a little birthday party at 5 p.m. – a little dinner for all of his New York friends.”

The locale for this milestone-marking event? “A Mexican restaurant,” she said. “He loves guacamole.”

But the rest of the birthday celebration will have to wait a bit. “His daddy is in London,” Paltrow, 35, said of husband Chris Martin. “So we’re going to do presents when we can all be together.”

In the meantime, Paltrow – whose daughter Apple turns four next month – is left marveling at how much her little boy has grown.

“[He's] not so little anymore,” she said. “He doesn’t like a stroller anymore, he doesn’t like a highchair. He likes his independence.”

PEOPLE