Teresa Giudice and family celebrate Gia Giudice's 12th Birthday. Credit: Splash News and Pictures

Have Melissa Gorga and Teresa Giudice made up? Despite an ongoing feud with her sister-in-law and Real Housewives of New Jersey costar, Gorga, 33, attended a birthday party for Giudice's daughter Gia's 12th birthday on Friday, Jan. 11. 

After ending season 4 in a bitter argument, the ladies appeared to be filming season 5 of the hit Bravo show during the party at Space Odyssey in Englewood, New Jersey. "Headed to Gia's big birthday party! They grow up so fast, don't they?" Giudice, 40, tweeted Friday.

Giudice and husband Joe, parents to four daughters, posed for a family photo in front of Gia's cake and cupcakes. Photographs of the adults from the party suggest there may have been some heated discussions. Gorga and Giudice were seen chatting with Kim DePaola and Jennifer Dalton with a few finger-pointing gestures. 

But Gorga and Giudice seem to be making the effort to get along. Gorga attended the party with her children Antonia, Gino and Joey, but husband Joe has been recovering from the flu.

"I'm dying over here in the hospital," Joe tweeted Thursday. "This flu kicked my ass."

Gorga said she was "nursing him back to health," and Giudice tweeted Friday, "My poor brother with this horrible flu. Everyone, please, get your flu shot!"