Drew Barrymore is heading deep into the heart of Texas, with “The Drew Barrymore Show” delivering a week’s worth of episodes from the Lonestar state.

In a sneak peek at the Monday, April 4 episode, Barrymore visits Magnolia Network founders Chip and Joanna Gaines at their home base in Waco, Texas.

What the couple doesn’t realize is that Barrymore has a big surprise for Joanna, courtesy of a late-night legend.

READ MORE: Chip And Joanna Gaines’ Magnolia Network Is Coming To Canada With Corus Launch

“I think I heard a rumour that maybe we might have the same person out there in the world who really does it for us,” Barrymore tells her.

“I wanna hear. Who?” Chip asks.

“Is it Mr. Letterman?” Joanna replies.

“For real?” Chip adds.

READ MORE: Chip And Joanna Gaines Show Off Their 2012 ‘Fixer Upper’ Audition Tape

Barrymore then rolls tape for a special greeting from David Letterman himself.

“Texas Week” begins Monday, April 4 on “The Drew Barrymore Show”, airing weekdays at 3 p.m. ET/PT on Global.