Jennifer Aniston pregnancy rumors are once again in full force after the actress was spotted looking noticeably a little bigger around the belly than usual. Aniston attended the New York premiere of her new movie "We're The Millers," where she plays a stripper, in a form-fitting purple satin dress.

The gown clearly highlighted her middle and sparked many rumors that the "Friends" star could be expecting her first child. The 44-year-old actress walked the red carpet solo but her fiancé Justin Theroux met up with her at the after party, MTV UK reports.

In an interview with Glamour magazine, Aniston hinted at starting a family saying that Theroux had already had parenting instincts.

"I know Justin, for instance, has extremely amazing paternal instincts," she said. "Because [growing up] he had to sort of become the parent. I think when you have to become the parent when you're a younger person, you learn those instincts."

This latest rumor comes just days after it was rumored that she was trying in-vitro fertilization to get pregnant. According to Radar Online, the actress has expressed interest in starting a family and was already undergoing the treatment in hopes that she would be pregnant by her 45th birthday on February 11.

"She definitely seemed to have gained some weight," a source told In Touch magazine. "She knows the clock is ticking - she's well aware of it. She's also done her homework. She's explored all methods for having a baby and knows what her options are with IVF. She's educated herself."

According to Radar, her rep is denying that she Aniston is expecting but a source told the website that Theroux is also ready to start a family.

"Justin didn't always want kids, but his life with Jen changed his perspective on being a dad."

As far as when she plans on tying the knot to her fiancé of nearly a year she recently told the Associated Press that she would get married to Theroux "when the time was right," USA Today reports.