Carrie Underwood [ tickets ] has added another slew of dates to her headlining trek, which intertwines with her co-bill outing alongside Keith Urban [ tickets ].

Last month, according to her publicist, the country songstress sold out the first round of dates on her "Carnival Ride Tour," and she resumed the trek last night (3/18) in Bethlehem, PA, following two weeks with Urban. Underwood's headlining jaunt is currently making its way through the eastern US, with a couple of stops in Ontario, and she'll rejoin Urban next month for nine dates along the East Coast. By late April, Underwood will be on her own again, playing a month's worth of newly added shows across the US. She also has a June gig booked at Nashville's Grand Ole Opry and several fair/festival performances stretching into September. Details are listed below.

Underwood got a big surprise earlier this month after she sang a Randy Travis song on GAC-TV's "Opry Live." Travis himself walked out on stage and asked the 25-year-old star if she would like to be the next member of the Grand Ole Opry, to which she tearfully replied, "Let me think about it. ... Yes!" The formal induction ceremony is scheduled for May 10.

Underwood made her Grand Ole Opry debut in June 2005, just two weeks after winning the FOX-TV talent competition "American Idol."

Since then, her 2005 debut album, "Some Hearts," has become the best-selling solo female country debut in the history of the Recording Industry Association of America, according to a press release. The set has sold more than 7 million copies and logged five No. 1 singles, including the Grammy-winning tunes "Jesus, Take the Wheel" and "Before He Cheats."

Underwood's October follow-up, "Carnival Ride," has reached double-platinum status on the strength of No. 1 hits "So Small" and "All-American Girl," which are her first co-written songs released as singles.

The three-time Grammy winner and reigning ACM and CMA Female Vocalist of the Year is up for more honors in the coming months, as she's vying for Video of the Year ("Wasted") and Female Video of the Year ("So Small") at the April 14 CMT Music Awards, and Top Female Vocalist at the May 18 ACM Awards.