The singer, 32, took to Instagram on Sunday to announce the presenting gig and shared a picture of colourful notes showing H.E.R will be the musical guest.
After sharing the exciting news on social media, dozens of music fans took to Twitter to speculate that the move could mean Adele is preparing to release new music.
Adele kept her announcement picture simple, opting for a yellow, blue and pink notes detailing the date, host, and entertainment set for SNL.
Alongside the snap, she penned: ‘Bloooooody hellllll I’m so excited about this!! And also absolutely terrified! My first ever hosting gig and for SNL of all things!!!!
‘I’ve always wanted to do it as a stand alone moment, so that I could roll up my sleeves and fully throw myself into it, but the time has never been right.
‘But if there was ever a time for any of us to jump head first into the deep end with our eyes closed and hope for the best it’s 2020 right?’
The star continued: ‘It’ll be almost 12 years to the day that I first appeared on the show, during an election…which went on to break my career in America, so it feels full circle and I just couldn’t possibly say no!
‘I am besides myself that H.E.R will be the musical guest!! 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. See you next week.’
Adele first appeared on Saturday Night Live back in 2008 and she performed songs Chasing Pavements and Cold Shoulder.
The star also appeared on SNL in 2015 when she was promoting 25, again singing two of her hit tunes – Hello and When We Were Young.
Adele hasn’t released any new music since the release of her third album, 25, in 2015 and she hasn’t had a major public appearance since the record’s tour in 2016.
Music fans were quick to flood Twitter with suggestions that Adele’s SNL appearance could mean she’s preparing to release new music.
One person wrote: ‘If Adele’s SNL appearance doesn’t have anything to do with new music coming form her I will be LIVID’
While another said: ‘If Adele drops new music I will take back anything bad I said about 2020.’
It comes after Adele treated fans to a rare glimpse at her close friendship with Nicole Richie, when she dedicated a heartfelt belated birthday post to the star.
The British singer took to Instagram to profess how much she ‘loves and admires’ the daughter of Lionel Richie, while also sharing a hilarious clip and fun-filled snaps.
The never-before-seen images also documented the star’s incredible weight loss after she lost a staggering seven stone last year.
In the video in question, Nicole was seen crouching on a kitchen floor, as she waited for the star to walk in – and duly frightened her with a loud ‘boo’ once she did.
Adele was seen yelping in fear, before leaning down to hug Nicole on the floor amid laughter. As she walked away, the still shook up star muttered: ‘For f**k’s sake!’
Also posting a selection of shots of herself with Nicole, whose 39th birthday fell on September 21, Adele wrote: ‘Happy belated birthday to my daily dose of grace @nicolerichie I admire you and love you so much.
‘You are the epitome of self preservation, self love and absolute savagery! You are so so cherished by so many angel girl! Keep making us laugh babes, we adore you to the moon and back ♥️.’
Adele is said to have lost a staggering seven stone due to a 1,000 calorie a day diet and upping her exercise, and she showed off her dramatic transformation on her 32nd birthday.
The star is reportedly in a good place both ‘physically and mentally’ following her dramatic weight loss.
Since unveiling her new look on her 32nd birthday, displaying her incredible lithe frame, the songstress has been showered with attention by fans and fellow celebs.
The singer has become increasingly health-conscious over recent months and a source close to the star praised her disciplined approach to her own well-being.
An insider previously told E! News: ‘She goes to different gyms. She goes early in the morning and meets with her trainer.
‘She gets her workout in first thing. She works out for about an hour and leaves drenched in sweat and looking like she worked very hard.’
Adele’s post came days after she and her rumoured love interest Skepta enjoyed a fun-filled night on the town, at a virtual reality centre in east London on Tuesday.
Having returned to the capital from her £7.7million Beverly Hills home, the Hello songstress was said to be putting on such a raucous display with the Boy Better Know star, who turned 38 last Saturday, at the futuristic venue.
The ‘couple’, who were joined by MC Jammer, were spotted at OTHERWORLD, an ‘innovative social entertainment concept using unique, multi-sensory virtual reality technology’, which is held in a converted railway arch in a backstreet in Haggerston.