She writes "Bloooooody hellllll I'm so excited about this!"
Fans can expect at least one joke or sketch acknowledging Adele's eye-popping 100lb weight loss since the summer of 2019.
Adele follows in the footsteps of a host of stars who have guest hosted the show, including Tom Hanks, Scarlett Johansson and Justin Timberlake.
The "Hello" singer-songwriter shared the very first behind-the-scenes photo from her first hosting gig on the late-night sketch comedy show last night (October 21), and she looks incredible!
Adele is gorgeous in a fitted, velvet dress with a deep V, with her blonde locks swept to the side.
Adele has given fans a sneak peek behind the scenes as she prepares to host Saturday Night Live for the first time.
"I always wanted to do this as a stand-alone moment, so I could roll my sleeves up and throw myself into them completely, but the time was never right".
On Monday, Adele dropped the bombshell news that she would be hosting the show, telling her 39.1 million followers that it was nearly 12 years to the day that she first appeared on the programme. I love her SO much I can't wait to melt into a flaming hot mess when she performs, then confuse myself while I laugh my arse off in between it all.
Seeing the comedian embarrassed about her impression, Adele transformed into a Valley girl/New Yorker/something else we can't place, responding, "Oh my God, no worries girlfriend".
It is still unknown when Adele will release her new album and she has repeatedly told fans to be patient. The swimsuit carried the Jamaican flag in honor of the Notting Hill Carnival, which became virtual this year due to the Coronavirus.