"Ugly Betty" castmates America Ferrera, Mark Indelicato and Ana Ortiz. Photo: Marion Curtis, StarPix

"Ugly Betty" teenage star Mark Indelicato was pretty and witty and bright at his 16th birthday party in New York City's Red Bull event space on Saturday night, joined by co-stars America Ferrera, Ana Ortiz, Judith Light and Michael Urie.

Dressed head-to-toe in downtown designer Jamison Ernest's Yellow Fever label (the event's sponsor), Indelicato celebrated with a curious admixture of friends, family and top models including Dree Hemingway, Karlie Kloss, Taryn Davidson and Linda Vojtova.

"I don't even know what I got for my birthday!" Mark told StyleList, his feet dancing as he gave the interview.

"All I wanted was to have everyone that I love here at my party!"

Mark said his personal style was more relaxed that Justin Suarez, his character on the show.

"I'm a bit more laid back, not as intense. You're seeing it here!" he said, indicating his white Yellow Fever blazer, T-shirt and jeans. "I like drama, I like fun."

Ortiz, who plays his mother on the show, seems to be one of the young star's biggest fans. "I have really had the chance to see Mark become an actor, and we've become very close," she told us.

"When I'm with him and his real mother, and he says 'mom,' we both turn around!"

Mark said his immediate plans were to think about college once "Ugly Betty" ends at the conclusion of this season, which is filming until the end of March.

But he is also interning at Teen Vogue, and has clearly caught the fashion bug. "'Ugly Betty' taught me everything about fashion," he said.

"I didn't know who Jimmy Choo was. I think Vanessa Williams was also a very big part of that, teaching me about the designers. I had no choice but to learn, and I'm glad I did."

And has he had a chance to meet the grown-up Vogue editor, Anna Wintour, while working at the magazine?

"Oh no, she's scary. She scares me!"

To hear what Anna Wintour is really like, read our exclusive interview with "The September Issue" director.