Jennifer Aniston reportedly "doesn't care" about Brad Pitt and Angelina Jolie's engagement.

The former 'Friends' actress - who was married to Brad for five years before he met Angelina on the set of 2005 movie 'Mr. & Mrs. Smith' - has since fallen in love with actor Justin Theroux and is said to be indifferent about her ex's plans to remarry.

A source told E! News: "She doesn't care. She really doesn't. She's happy with Justin. She'll probably marry him. She's moved on. People don't want to believe it, but she has."

Jennifer, 43, recently revealed her new man and 'Wanderlust' co-star, is her "protector", and is said to be hoping for a marriage of her own by the end of the year.

According to an insider, she told friends: "Things are fabulous, I'm happy.

"If he's not got down on one knee, or we're not married, by the end of the year, it's over!"

The couple - who adopted a puppy called Sophie together in February - are set to move into a luxury home in Bel Air, Los Angeles, once renovations are complete.