Keith Urban and Carrie Underwood will co-headline the Love, Pain & the Whole Crazy Carnival Ride Tour in 2008. The 24-city tour will begin Jan. 31, and tickets will go on sale Dec. 1. Although the kick-off city has not been announced, most of the tour dates will take place east of the Mississippi River. The tour gets its name from the titles of two albums -- Urban's double-platinum Love, Pain & the Whole Crazy Thing and Underwood's just-released Carnival Ride. "I'm looking forward to hitting the road with Carrie and to bringing our audiences together for what I think will be a magical night of sights, sounds, songs and solos," said Urban. Underwood noted, "I can't think of a better person to begin 2008 with than Keith. He is an amazing entertainer and a well-respected musician, singer and songwriter."