Ariana Grande served as host and Cher performed as the musical guest during the Dec. 20 episode of 'Saturday Night Live.' Here, see the best, worst and most oops moments in our roundup of the highs, lows and yikes from the latest episode of 'SNL.

A meme showed alleged quotes from the pair, including one with the famous singer telling the White House press secretary, "Sweetheart, take a seat."

“Cher, killing it at 79,” another quipped. “Idc [I don’t care] about her lip syncing, it’s late, she’s 80, she just wants to have some fun,” one watcher wrote in the YouTube c omments.

Cher also rocked $6,400 sweatpants for her first SNL performance in almost 40 years.

Ariana Grande hosts the 'Saturday Night Live' season 51 Christmas episode with musical guest Cher as Bowen Yang says goodbye to 'SNL.'

Music icon Cher, 79, wowed viewers with her ageless look and hilarious cameo alongside Ariana Grande and Bowen Yang on Saturday Night Live. See details.

Cher's new holiday single “Christmas Is Here” debuts at No. 2 on a Billboard chart, blocked from becoming another No. 1 for the star by a rising viral cut.

“Saturday Night Live” fans “Believe” Cher was lip-syncing on the show this weekend. The 79-year-old pop icon was the musical guest on the sketch comedy program’s final episode of the year on Saturday, taking the stage to sing “DJ Play a Christmas Song” and “Run Run Rudolph.”

The pop superstar and her boyfriend, Oakland native Alexander "AE" Edwards, attended the "Saturday Night Live" after-party together in New York.