Golden girl! Emmy Rossum shines in tight-fitting gown at DKNY party for NYFW... before revealing she 'twerked' on stage

By Daily Mail Reporter

PUBLISHED: 01:04 EST, 10 September 2013 | UPDATED: 02:25 EST, 10 September 2013

She has already impressed at New York Fashion Week in numerous outfits.

But it seems actress Emmy Rossum was only getting started.

Emmy, whose aunt is designer Vera Wang, looked stunning at the DKNY 25th Birthday Bash in New York on Monday in a tight-fitting gold dress.

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Golden touch: Emmy Rossum shines at the DKNY 25th Anniversary party in New York for NYFW

Wearing sky-high Louboutin heels, the 26-year-old Emmy stole the show from other celebrities including Rita Ora and Karlie Kloss.

However, 25-year-old Puerto Rican model Joan Smalls certainly turned heads with her outfit.

The model showed off her toned tummy in a midriff-exposing outfit that included a long netted skirt.

Golden girl: Emmy wowed in her tight-fitting dress, and later joined rapper Iggy Azalea on stage

Making a statement: Model Joan Smalls arrives at the DKNY 25 Birthday Bash on Monday revealing her toned stomach

Interesting ensemble: Rita Ora went for a baseball-inspired look in a white jacket and graphic print top

VIPs: Emmy Rossum, Joan Smalls, Rita Ora and Karlie Kloss pose together at the DKNY 25 Birthday Bash

Pop singer Rita went for an odd paisley-patterned dressed with a white baseball-inspired jacket.

Model Karlie Kloss was a vision in blue in a short dress and matching shoes.

It certainly seemed to be an eventful evening, which saw a performance from rapper of the moment Iggy Azalea.

Twerk it out: Emmy Rossum keeps a close eye on Change Your Life rapper Iggy Azalea as she performs to the crowd

Impromptu: Emmy Rossum takes the stage with critically-acclaimed rapper Iggy Azalea before revealing that she 'twerked'

Into the blue! Supermodel Karlie Kloss looked gorgeous in her vibrant ensemble with matching shoes

Dig in! Karlie Kloss, Iggy Azalea, Joan Smalls, Rita Ora and Donna Karan tuck into a custom made DKNY cake

Performers: A$AP Rocky and his model girlfriend Chanel Iman also attended the bash, although did not seem in high spirits

Cause for celebration: Donna Karen and Rita Ora pose by the birthday cake at the event

Iggy - whose new single Change Your Life is due for release this month - was even joined on stage by actress Emmy.

Emmy later tweeted that she had 'twerked' with the rapper.

'I may have just been convinced by @ritaora to twerk on stage w her @karliekloss @joansmalls and @IGGYAZALEA. Hope mom doesn't see. #dkny25' she wrote.

She added: 'Got home and told my mom I twerked. She said, "Did you throw your back out?!"''

Partners in crime: Emmy revealed that it was Rita who persuaded her to try out twerking on stage with the rapper Iggy Azalea

Pretty: Actress Hailee Steinfeld looked cool in her casual top and netted black skirt at the event

Team with the theme: Actress Alexandra Daddario was another guest who went for a blue ensemble

Guests: Both Margarita Levieva and Christine Teigen went for black ensembles

Not all A-List, then: Perez Hilton and Bernadette Peters also showed up to the event