Take a second to let that all sink in. Or ponder natural selection.
Neither Vegrara nor Manganiello publicly confirmed the news, and reps for both actors did not respond to requests for comment.
If hot couple-o-meters existed, this comely pair sent them through the roof since being first linked in July.
Vergara, 42, and Manganiello spent Christmas and Manganiello's 38th birthday in Hawaii with family. On Sunday, the Colombian actress took to WhoSay to share her well wishes for her beau.
"Happy happy bday to my love and best friend ... to the one that makes me laugh like crazy!have a healthy wonderfull year babe!!!@joemanganiello," she wrote, posting a snapshot hugging her man.
It'll be the first marriage for Manganiello and the second for Vergara, who wed Joe Gonzalez when she was 18. The two have an adult son named Manolo together.
The Emmy-nominated actress announced in May that she called off her engagement to her man of nearly four years, Nick Loeb, citing hectic work schedules keeping them apart.
Before she and Manganiello started dating, the "Magic Mike" star revealed in People magazine's hottest bachelors issue that Vergara was his celebrity crush.
"She's got the curves, she's got a beautiful face, beautiful hair, just gorgeous. Naturally beautiful. She's feisty!" he said.
The couple first met in May at the White House Correspondents' Dinner (where he was also photographed staring at her famous curves), but the actress was still with Loeb at the time and Manganiello said he wasn't a "home-wrecker."
"There was a picture someone snapped at the White House Correspondents' Dinner where they caught me looking at Sofia Vergara's butt," he said. "When you talk about being manipulated, that's what I'm talking about. It's like a moment of zen. There is nothing in my brain. If only I could meditate that well. I don't go after other people's women. She's got a guy. If she was single, I would be like, poof!"
The Italian actor later said on "On Air With Ryan Seacrest" that he had "forgotten" he had said those things about his lady love.
"And when the magazine came out, by that time, we were seeing each other and when I got the magazine and opened it up and read it, I forgot I said that. I started laughing."