Kobe Bryant brought his entire family to the Taylor Swift concert at the Rose Bowl in Pasadena over the weekend ... even busting out some dance moves to "Shake It Off."

Kobe and Taylor have been friends for a little while ... remember, it was Kobe who played M.C. when she got a banner at Staples Center back in 2015 for "Most Sold Out Performances."

This time, Bryant didn't have any official duties -- but he did get V.I.P. access for his daughters to hang with Taylor backstage ... where his wife, Vanessa, also kicked it with Julia Roberts!

Retirement ain't so bad, is it, Kobe?

There were a TON of famous people at the show including Rebel Wilson, Miles Teller, Bill Nye, Sarah Michelle Gellar ... and get this -- Amber Rose and her ex, Wiz Khalifa, arrived together with their kid!