The Allentown Fair is getting a double dose of teen star power.

Singing sensations Austin Mahone and Bridgit Mendler will headline a show at the fair on August 28, organizers announced Friday.

Mahone is known for his chart-topping hits "11:11" and "Say Somethin.'"

Mendler stars on the Disney show "Good Luck Charlie," and her first album debuted at #30 on the Billboard charts.

Tickets for the show will go on sale March 2. They cost between $25 and $39.