Jennifer Aniston wishes ex-husband Brad Pitt nothing but happiness following his engagement to long term partner Angelina Jolie.

The actress has moved on and is now dating boyfriend Justin Theroux. They will celebrate their one-year anniversary next month.

And a source tells People magazine that Jennifer holds no resentment towards the couple who have denied starting their relationship when Brad was still with the former Friends star.

"Jen moved on a long time ago, and she is trying to just focus on her own happiness," an insider said of the 43-year-old actress.

"Jen is not a bitter person and she always wanted Brad to be happy.

"Jen spent many happy years with Brad and thinks their divorce was meant to be. She is very happy with Justin and that's what she is focusing on right now."

Jennifer and Brad tied the knot in 2000 but divorced five years later. Brad went public with Angelina soon after and they are now raising six children together.

Meanwhile, it was recently announced that Angelina has been promoted to Special Envoy of United Nations High Commissioner Antonio Guterres.

"In her new role she is expected to focus on large-scale crises," the UNHCR said in a statement.