The former Girls Next Door favourite-turned-Las Vegas star joined Hollywood's finest at Park City, Utah over the weekend, where husband Pasquale was promoting a new documentary called Under The Electric Sky that he has executive produced.
It's about the Electric Daisy Carnival, the largest dance event in North America.
Holly was seen cuddling up to Pasquale on 17 January at the Tao party, and again two nights later at the Le Bare after party, presumably while little Rainbow was safely tucked up in bed!
But Rainbow certainly wasn't absent from proceedings as proud mum Holly, 34, shared a very cute picture of her tiny daughter en route to the festival last week, showing Rainbow bundled up against the cold in a fluffy blue Mickey Mouse hat.
Another picture showed Holly and Pasquale posing with their furry pink onesie-clad daughter at an icy-themed event. We're loving the look on Rainbow's face!
Last year was memorable for Holly and Pasquale as not only did they welcome their first child together, they also tied the knot!
Holly gave birth to Rainbow Aurora Pasquale in March, then six months later, she married businessman Pasquale at an evening ceremony at Disneyland, California, with the park being shut down especially for them.