Los Angeles: Hollywood star Robert Downey Jr has officially joined the online photo-sharing application Instagram.


Jimmy Kimmel, Chris Evans, Chris Hemsworth, Jeremy Renner, Scarlett Johansson, Mark Ruffalo and Robert Downey Jr on sets of 'Jimmy Kimmel Live!' Picture courtesy Robert Downey Jr Instagram account 

The 50-year-old 'Iron Man' actor made his Instagram debut with a photo of him, Jimmy Kimmel and 'The Avengers' co-stars all seated in a row backstage at 'Jimmy Kimmel Live!', reported Aceshowbiz.