Taylor Swift had one very special guest join her on stage at Staples Center for the fifth – and last – of her record-breaking sold out shows in Los Angeles on her 1989 World Tour.

Bestie Selena Gomez, 23, sent fans crazy when she appeared with Taylor, 25, in a spectacular performance that was a fitting conclusion to the phenomenally successful five night run.

The duo sang Selena’s single Good For You that Taylor said back in June was her ‘favorite thing she’s ever done’.

The besties wore sexy outfits for their duet and both had on thigh high black heeled boots.

Taylor wore a white cropped top that flashed some cleavage and a pair of white hot pants connected to her boots with suspenders.

Selena opted for a black romper with spaghetti straps and a plunging neckline.

Also joining the Shake It Off star on stage was actress Lisa Kudrow.

In a surprise move, the Friends star sang her sitcom character Phoebe’s composition Smelly Cat with Taylor, which almost brought the house down.

But The Fearless star wasn’t done yet.

Next up was Justin Timberlake.