It's Official! Sofia Vergara Brings New Boy Toy Joe Manganiello To Her Birthday Party -- 'They Were Really Flirty!' Says Eyewitness

Another year older and a new boyfriend.

As Sofia Vergara rang in her 42nd birthday on Thursday night surrounded by family and friends, RadarOnline.com has exclusively learned she also brought along the new man in her life, True Blood hunk Joe Manganiello.

Following a breakup with former fiancé Nick Loeb, reports quickly surfaced that the Modern Family star had moved on with Manganiello, 37, and it certainly seemed that way at her birthday party.

"Sofia and Joe were extremely flirty with each other and you couldn't wipe the smile off Sofia's face," an insider told RadarOnline.com.

"They were all over each other."

But Vergara appears to be keeping the new relationship on the down-low, posting only one photo from the party on her Instagram account with Manganiello nowhere in sight.

As RadarOnline.com previously reported, the 6'5" actor has allegedly been "smitten with her for years" and grabbed the opportunity to make an impression when the they met for the first time at the White House Correspondents Dinner in May.

"They aren't really public yet, but posed for flirty photos with their friends at the birthday party," the source continued.

"They laughed together all night long."

Vergara dated Loeb on and off for four years but ended the engagement in May, telling fans, "We have been having too many problems with figuring out how to spend time together and because of my work and now his, it’s been getting worse and worse."