Scott Disick hosted a Labor Day soiree at the Pussycat Dolls Dollhouse at the Keating Hotel in San Diego on Saturday night.
Dressed in a custom Astor & Black suit, the Keeping Up With the Kardashians star arrived in style in a Mercedes Maybach.
Sipping on Bud Light, the reality star "appeared relaxed as he chatted with friends and posed for photos with fans," an onlooker tells PEOPLE.
When asked about life as a father of two with longtime girlfriend Kourtney Kardashian, Disick noted that while his son, Mason, is "taking on the big brother role well, nothing major has changed."
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