75 Main’s owner Zach Erdem celebrated his birthday on Saturday with DJ L from Switzerland and a few hundred of his closest friends. Apparently he’s 21 or over now. This was a busy weekend for the Southampton hotspot, 75 Main. Actor Cheech Marin was seen having breakfast with a group of friends, while “New Jersey Housewife” Dina Manzo was spotted having dinner with a few of her girlfriends later that night. Also dining, at separate tables, was the “Keeping up with the Kardashians” star Jonathan Cheban, Lorraine Smith, mother of singer-songwriter Ne-Yo, and “Final Destination 2” actor Michael Landes.