Star-studded line-up announced for final episodes of The Ellen DeGeneres Show

Ellen DeGeneres is ending her show after 19 seasons (PA)

Former US first lady Michelle Obama, Serena Williams and Zac Efron are among the stars who will join Ellen DeGeneres in the final months of her daytime chat show.

The Ellen DeGeneres Show will air its last episode on May 26 after 19 seasons following allegations its host oversaw a toxic workplace environment.