Pharrell Williams and Calvin Harris will perform at this year's T in the Park music festival.
They will share the bill with Arctic Monkeys and Paolo Nutini, who have already been confirmed for the three-day event at Balado in Kinross-shire.
Other big acts include Biffy Clyro, Ed Sheeran, Ellie Goulding, Jake Bugg, Rudimental and Disclosure.
The Manic Street Preachers and Pixies will also play what organiser DF Concerts is calling an "unmissable" weekend of music.
Crowds of 85,000 are expected to watch some of the industry's top artists perform from July 11 to 13.
Biffy Clyro guitarist and singer Simon Neil said: "We wouldn't be here, doing this now, if it wasn't for playing T in the Park. It just feels poetic to be headlining on our 10th time. W e can't wait."
Calvin said: "Last year was incredible, so I can't wait to be back this year. It's going to be amazing."
Festival director Geoff Ellis said: "Every year we ask our audience which acts they'd like to see at T in the Park, and we're thrilled to have some great acts joining us in Balado once again this summer.
"Biffy Clyro, Calvin Harris, Paolo Nutini and Pharrell Williams are big favourites with the T in the Park fans, and I'm sure it'll be a very special weekend."
Tickets go on sale at 9am on Friday from www.tinthepark.com.