Jennifer Aniston and her beau Justin Theroux are engaged to marry.

The 43-year-old actress and the 41-year-old actor have been dating for around 15 months.

Jennifer and Justin enjoyed a European vacation together earlier this summer, but they have been apart over the past few weeks.

Rumours that their relationship was on the rocks were rampant, but the couple are indeed going strong and will marry in the near future.

"Justin Theroux had an amazing birthday on Friday, receiving an extraordinary gift when his girlfriend, Jennifer Aniston, accepted his proposal of marriage," the actor's representatives told People magazine.

The couple began dating after they shot movie Wanderlust together and there are rumours they are planning to wed in Greece later on this year.

Jennifer and Brad Pitt tied the knot in 2000, but divorced five years later. Brad went public with his and Angelina Jolie's romantic relationship soon after and they are now raising six children together.

Brad and Angelina are also currently betrothed.