The Big Bang Theory actress confirmed her split from Josh Resnik earlier this month.
The pair had previously announced their engagement in October last year.
The 26-year-old was seen with a mystery partner while attending the Bardot nightclub in Hollywood on St Patrick's Day, reports People.
Cuoco and her friend were reportedly close to each other all night while she celebrated her Zooey magazine cover shoot at a Cellairis-sponsored event.
"Kaley and the guy were giggling all night in the VIP section, where they were kissing, dancing and even did an impromptu photo shoot, making funny faces together," a source said.
"Kaley seemed like she was truly having a good time and was completely being herself."
The insider added that Cuoco appeared "light and casual" during the evening.
"She looked like she was just out to have a good time," they said.
Cuoco's co-star Kunal Nayyar recently married his partner Neha Kapur in a six-day ceremony in India.
Watch Kaley Cuoco in The Big Bang Theory below: