Jennifer Garner and Ben Affleck took the kids to Montana for a Valentine's vacation, prompting rumors about the couple getting back together after theirdivorce last year.

On Sunday night, the 43-year-old actress was all dressed up to attend the premiere of her new film, "Miracles from Heaven," but she wasn't accompanied by the "Batman V Superman: Dawn of Justice" actor.

"Dressing to impress for her evening in the spotlight, the 43-year-old actress looked simplistically chic in a frilled sleeveless black dress," reported Daily Mail.

"The former Alias star opted for an elegant appearance as she paired the effortless LBD with a pair of strappy black heels."

Source: vintage formal dresses

"Miracles from Heaven" tells the story of Christy Beam, played by Garner, who desperately wants to find a cure for her daughter, Anna, 10, after knowing that she has a rare and incurable disease.

"After Anna has a freak accident, an extraordinary miracle unfolds in the wake of her dramatic rescue that leaves medical specialists mystified, her family restored and their community inspired," the synopsis said.

Jennifer Garner had just come off a vacation in Big Sky, Montana with Ben Affleck, along with their three kids. It was their second family getaway since thedivorce announcement in the middle of last year.

They were also joined by Tom Brady and Gisele Bundchen in their skiing vacation, according to multiple reports.

But People claimed that there's no chance of Jennifer Garner and Ben Affleck reuniting following their divorce.

"She seems much more relaxed and is enjoying life," the alleged source claimed. "It's great to see her happy again."

Ben Affleck and Jennifer Garner are still living in the same compound in the family home even after the divorce, but it was for the sake of the kids.

"The kids love when Ben is home and that's why Jen let him stay at the family house," the article added. "She never wanted them to be disappointed that Ben wasn't there. But it was emotionally draining for her."

Read more: backless formal dresses