India, Aug. 28 -- A ctor Jennifer Aniston and her boyfriend, author Jim Curtis, were spotted enjoying a double date with her Friends co-stars Courtney Cox and Lisa Kudrow on Tuesday. The group met at California's Sunset Tower Hotel, where they were also joined by actors Jason Bateman and Will Arnett. Aniston, 57, and Curtis, 50, have kept their relationship largely low-key since they began dating in July last year. The two had earlier been spotted together in California as well as on holiday in Spain. Aniston had made their relationship Instagram official in November when she wished Curtis a happy birthday on November 2, sharing a photo of the couple wrapped in a warm embrace and writing, "Happy birthday my love." HTC...