New details about "Batman V Superman: Dawn of Justice" star Ben Affleck's alleged affair with Christine Ouzounian has come to light and a source close to the former nanny claims that the duo had planned to celebrate the actor's birthday (15 August) together.

Although Affleck has denied the affair saying they had nothing more than a professional relationship and friendship, a source close to Ouzounian told People that the nanny was serious about the romance. She is even believed to have shown her friends pictures of the duo kissing.

"For Christine, it was a real relationship. They had even talked about plans for celebrating his upcoming [Aug. 15] birthday," the source said.

Ouzounian, who claims to have slept with Affleck, has been keeping a low profile ever since the news of the alleged affair surfaced. According to a recent People report, she has been hiding out at Hotel Bel-Air, a place frequented by Affleck.

Affleck is reportedly taking care of Ouzounian's expenses at the hotel as well.

"Christine is enjoying her hotel stay," an eyewitness told the media outlet. "She acts like she is on vacation. She has been spotted by the pool several times, the spa and Wolfgang Puck's restaurant. She seems relaxed and happy. She hangs out with girlfriends, reads magazines and is on her phone a lot."

A friend of Ouzouzian claimed that the former nanny is still in touch with Affleck. They "are in touch every day, all day long. He got them phones just for each other."

Ouzounian was hired by Affleck and Garner last spring and she "was very caring and loving towards the kids". But, things started getting out of hand when Garner began filming "Nine Lives" in Canada. Ouzounian began spending more time with Affleck during Garner's absence and "dressing a bit more inappropriately" around him, a source told People.

Garner is reportedly handling the situation well, thanks to a strong support system comprising her family and friends. Her immediate concern is the well-being of her three children -- 9-year-old Violet, 6-year-old Seraphina, and 3-year-old Samuel.