Kaley Cuoco isn't moping around following her split from ex-fiancé Josh Resnik.

In fact, the Big Bang Theory star, 26, may have already moved on to a new beau.

The actress headed out to Bardot nightclub in Hollywood on St. Patrick's Day, where she and a mystery man spent the evening attached at the hip, celebrating her Zooey magazine cover at a Cellairis-sponsored party.

"Kaley and the guy were giggling all night in the V.I.P. section, where they were kissing, dancing and even did an impromptu photo shoot, making funny faces together," an onlooker tells PEOPLE. "Kaley seemed like she was truly having a good time and was completely being herself."

Adding that the evening seemed "light and casual" for the starlet – who was "beaming" in a yellow ensemble throughout the night – the source says, "She looked like she was just out to have a good time."

Cuoco, whose engagement was announced in October, broke the news of her split at an event earlier this month.

A rep for Cuoco has no comment.

滬江娛樂(lè)快訊：去年10月份被爆與戒癮治療師男友訂婚的卡蕾·庫(kù)奧科，僅幾個(gè)月后接受采訪時(shí)即自爆婚約取消。當(dāng)大家都以為“潘妮”正處在感情低谷期時(shí)，日前有目擊者稱(chēng)看到她在夜店與一神秘男子在一起跳舞，舉止親密?！彼麄冋泶粼赩IP包廂里，喝酒玩親親，卡蕾看起來(lái)很快樂(lè)，很自我?！苯?jīng)紀(jì)人表示無(wú)可奉告，不知卡蕾是不是找到了新的歸宿呢？