NEW YORK (CBSNewYork) – On The Late Late Show Thursday night, singer Meghan Trainor joined host James Corden for another edition of Carpool Karaoke.

And of course, they sand Trainor’s breakthrough hit “All About That Bass.”

READ MORE: Fountain Pen Hospital: Tribeca's Home For Fine Writing Instruments Since 1946

RelatedMore Celebrity Carpool Karaoke Appearances

During that car ride, Trainor told Corden that one person she was truly starstruck over was none other than TV’s Dr. Phil.

READ MORE: Violent Week In The Bronx Continues As Cab Driver Stabbed, Convenience Store Worker Robbed And Stabbed

Would you know it? At a stoplight, that’s who hopped into the back seat.

Trainor had a little mini-session with the good doctor, talking about her struggles with anxiety.

MORE NEWS: 'SNL' Comics Colin Jost, Pete Davidson Buy Staten Island Ferry Boat

Dr. Phil even joined in the sing-along.