JUST ADDED: 5 Seconds of Summer will be rocking the stage at this year's iHeartRadio Music Festival Village in Las Vegas! The band sat down with Ryan Seacrest to break the news. Click here to buy your tickets now, before they sell out!


Check out the full lineup for this year's iHeartRadio Music Festival



Listen to the Arianna Grande on iHeartRadio | Listen to The Wanted on iHeartRadio

(TMZ) - Almost is never enough for Ariana Grande and The Wanted singer Nathan Sykes ... so they're going all the way ... sources tell TMZ, the two are OFFICIALLY dating.

Ariana and Nathan have been canoodling for weeks - and even filmed a steamy music video together for their song "Almost Is Never Enough" - but according to sources close to the couple, they've now officially DTR'd.

This means Justin Bieber - who was rumored to be hooking up with Ariana - is completely out of the picture.

Congratulations ... on more counts than one.


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