Cullum will hit some of his biggest North American venues yet on the trek, which launches September 24 at the Las Vegas Hilton. The singer/pianist will be on his own for the Vegas gig, but Ritter will join him two days later in St. Louis, Mo., staying on board for the length of the tour.

The 23-date trek will finish up at The Wiltern LG in Los Angeles October 26.

Cullum has been on the road almost non-stop since releasing Catching Tales last October. The British musician is currently finishing up the European summer festival circuit, with gigs planned through early August in Norway, Poland, Germany and more.

Ritter’s latest album, The Animal Years, hit stores in April.