Aniston celebrated her 45th birthday with close friends Soho house in Los Angeles while 'The Charlies Angels' star attended a party at the Deth Killers store in New York city, reported People magazine.
A rep said Theroux looked upbeat and happy as he tried out different merchandise in the store.
"Justin was upbeat and laughing in the shop with Orlando, as he tried on different hats, which he ended up wearing out at the end of the night," he said.
Aniston's party was attended by her 'Friends' co-star Courtney Cox, actor Tobey Maguire's wife, Jennifer Meyer among others.