Caught in the Act

Emily Maynard Toasts Fiancé Jef Holm's Birthday with Lovey-Dovey Dinner Party

07/30/2012 at 05:25 PM EDT

Bachelorette star Emily Maynard and her fiancé, Jef Holm, continued to make their love known during a recent celebration for the reality winner's 28th birthday.

Hosting a party for friends at New York City's Dream Downtown Hotel, Holm and Maynard "were often seen holding hands under the table," an onlooker tells PEOPLE. "Every time Emily got up from the table, Jef stood up. And every time she came back to the table, he would pull her chair out for her like a real gentleman."

The guests – who drank champagne and cocktails and dined on burgers, salmon and seafood at the hotel's Marble Lane restaurant – made their way to the venue's rooftop lounge after dinner, where, the source adds, Holm looked "shocked and embarrassed, but loved the attention" after being surprised with a birthday cake.

According to the source, the gang partied until 3 a.m.
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