Watch Demi Lovato Get Birthday Serenade from 'Walking Dead' Cast

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Demi Lovato photographed on May 14, 2016 in Carson, Calif.

Demi Lovato got a zombie-riffic birthday surprise from cast members of her favorite television show, The Walking Dead.

The AMC program’s Andrew Lincoln ( who plays Rick Grimes) and Norman Reedus (Daryl Dixon) sang the pop star happy birthday in a special recorded video from her 24th birthday on Saturday (Aug. 20). Lovato shared the clip, which featured Reedus wearing a plastic lion mask, on Snapchat Friday evening.

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The singer was beyond excited by the special birthday serenade. “I just got the best birthday video sent from the cast of the walking dead and I’m shitting my pants,” she wrote on Twitter.

Watch below.