@aubreyoday / Instagram 1 / 8
@aubreyoday / Instagram 1 / 8

Pauly D has pulled the plug on his 9-month relationship with Aubrey O' Day, but it's likely that she has no idea that she's now suddenly single.

Last week, the former Danity Kane singer began shooting in the "Celebrity Big Brother" house. In the house, stars are famously sequestered and entirely cut off from the outside world.

TMZ reported that Pauly ended things over the weekend, but it's not known why. The have been together since meeting on E!'s "Famously Single" reality show last fall.

Pauly has since erased all images of Aubrey on his social media, expect for pictures that promote "Famously Single."

Last week, just before leaving for the "Big Brother" house, Aubrey seemed smitten with her man, posting a picture of him holding her two dogs.

"My dearest hubby @djpaulyd, I will miss you so much. You are my best friend, my lover, my person, my soulmate!," she wrote. "Hold the fort down.. take care of our babies.. hopefully I'll come home with an amazing accent ;)! LOVE YOU with all my heart! #mifamilia."

The couple has had their ups and downs. Last May they briefly split after it was reported that the father of one may be cheating on her.

"Someone anonymously sent Aubrey screen grabs of conversations Pauly was having with another other girl," a source told the New York Post. "It was clear he was being unfaithful so Aubrey broke it off."

They quickly got back together after that and appeared happy, at least on the surface. In June, TMZ cameras caught them in Los Angeles and Aubrey even began saying that she was ready for him to propose -- Like, for real propose, not their April Fool's Day prank.

"We connect in a really interesting way," she said of the former MTV star in February. "['Famously Single'] is about all of us coming together, dating, learning through a dating coach how to go out there and approach people that are better suited for us and kind of get over the issues that we were having."

She continued, "And it ended up just like becoming like this chemistry happened within the house with a few of the cast-mates and Pauly and I were one of them."

If she only knew...