Ariana Grande excites fans as she reunites NSYNC at Coachella - but where is Justin Timberlake?

Ariana Grande said she had been “rehearsing her whole f****** life” as she introduced NSYNC at Coachella.

The 25-year-old singer excited fans everywhere as she reunited the 1990s boyband during her headline set, minus Justin Timberlake.

Rumours of a reunion had been rife but were only confirmed hours before when the band shared a selfie of them all together, before heading out on stage to join in Grande’s track break up with your girlfriend, I’m bored.

“I've been rehearsing my whole f****** life for this moment!” Grande shouted as she introduced JC Chasez, Joey Fatone, Lance Bass and Chris Kirkpatrick in California. Timberlake skipped out on the reunion as he wrapped up his 115-show Man of the Woods tour.

Grande and the NSYNC boys then performed their hit Tearing Up My Heart for the adoring – and very loud – crowd.

The US pop superstar also performed with Nicki Minaj during her Coachella set but the performance was blighted by sound issues, causing fans to brand it “a bit of a mess”.

Minaj was barely audible and kept touching her ear as they sang their collaboration Side to Side.

Grande later appeared to shout “we can’t hear anything” as Minaj launched into her Bang Bang rap.

The technical issues seemed to linger, with fans complaining of similar audio problems when P Diddy and Ma$e later joined her on stage.

Before their performance, P Diddy paid tribute to his “sister” Grande who has recently shared her ongoing struggle with post-traumatic stress disorder with fans.

Last week, Grande posted a picture of her brain scan almost two years after the Manchester Arena bombing and several months after different traumas including the death of her ex-boyfriend Mac Miller.

She labelled the scan “hilarious and terrifying” as she opened up about her mental wellbeing with fans on Instagram.