A few more cities are expected to be added to the upcoming Keith Urban [ tickets ] / Carrie Underwood [ tickets ] trek ahead of its late-January launch.

Though the details have yet to be announced, the country stars' reps said Sacramento, CA; Peoria, IL; and Baltimore, MD, will be squeezed into the "Love, Pain & the Whole Crazy Carnival Ride Tour." So far, tickets are selling like hotcakes, with multiple shows already sold out, according to a press release.

The US outing is scheduled to kick off Jan. 31 with a two-night stand in Uncasville, CT, and visit arenas from coast to coast through late April. The current itinerary is listed below.

Urban, who recently announced that he and wife Nicole Kidman are expecting a baby, continues to support his latest No. 1 studio set, "Love, Pain & the Whole Crazy Thing," as well as his recent best-of collection, "Keith Urban Greatest Hits: 18 Kids." In addition to his concerts with Underwood, Urban has slotted in a March tour of Australia and several dates on Kenny Chesney's upcoming stadium tour. Urban's full itinerary can be found at his website.

Earlier this month, Underwood began announcing plans for her own headlining stint, which will intertwine with the Urban co-bill. The first half-dozen dates on that trek are posted at Underwood's website. The Grammy-winning songstress is supporting her double-platinum-selling sophomore set,"Carnival Ride," which has spawned the hit single "So Small," her fifth consecutive country chart topper.

Underwood, a two-time Grammy winner and the reigning ACM and CMA Female Vocalist of the Year, recently made history by becoming the No. 1 best-selling female artist across all genres for two years in a row, according to a press release.