Toby Keith and Luke Bryan have been announced as performers for the 2013 Houston Livestock Show and Rodeo annual event, joining fellow country superstar Jason Aldean. Pop superstar and 'X Factor' judge Demi Lovato is also booked as a big act at the much-anticipated rodeo.

Keith will kick off the popular music extravaganza on Feb. 25, with Aldean and Bryan scheduled to perform on March 11 and March 16, respectively. The Houston Livestock Show and Rodeo -- best known for their country-heavy line-ups, appropriately -- is expected to announce the remainder of their performer roster on Jan. 7.

As we previously reported, George Strait will close the multi-week event with a performance at Reliant Stadium. The retiring Texas country superstar will bid farewell to the long-running rodeo with his first appearance there since 2003, with Martina McBride and Randy Rogers Band on-hand to provide opening entertainment.

The Houston Livestock Show and Rodeo is once again offering its usual partial season pass packages for fans hoping to take in as much of the 2013 lineup as possible. Keith and Lovato are part of Option A, and Aldean and Bryan belong to Option B. Upper-level ticket prices start at $154 for A and $146 for B.

Mini-season and season ticket packages are now on-sale by phone or by visiting the event's official website. Tickets for individual nights will be made available to the general public on Jan. 12.