Darci Lynne, the “America’s Got Talent” sensation who performed to sellout audiences at Chevalier Theatre in 2018 and also played at Chevalier in 2019, returns to Medford with her show “My Lips Are Sealed (Except When They’re Not).” The singer/ventriloquist was the youngest (age 12) “America’s Got Talent” champion, winning the hearts of America with her sweetheart disposition and undeniable talent. Now 17, she has performed at the Grand Ole Opry, opened for Fergie at Caesar’s Palace on New Year’s Eve, and starred in her own NBC Christmas special. Her popularity on stage and TV has expanded onto the social media scene, where she has 4 million followers on TikTok. Tickets are $31.50 to $51.50 through the Chevalier Theatre website/Tickemaster. Tickets also may be purchased, free of online ordering fees, at the Chevalier Theatre Box Office, which is open on Fridays and Saturdays from noon to 6 p.m., as well as two hours before every Chevalier Theatre show.