The 'Let There Be Love' songstress was accompanied by her fiance Matt Rutler and wore a red figure-hugging dress, reported Ace showbiz.
She completed her looks by arranging her blonde hair in curls and donning a red lip colour.
The event, which was held at NASA Ames Research Center in Mountain View, California, was hosted by Seth MacFarlane. Other celebrities including Cameron Diaz, Benedict Cumberbatch, Jon Hamm and Kate Beckinsale also attended the event.
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