Krasinski kicked off the night with a rare appearance from a host in the Cold Open, playing Tom Brady, and then proceeded to kiss Pete Davidson in his monologue. Not to be outdone, Kelly took the stage for his first performance of the night and belted out his hit "My Ex’s Best Friend" to the delight of everyone.
Kelly went full rock star during his first set, stepping (and almost stumbling) over amps while playing and finally throwing his bright pink electric guitar into what appeared to be the audience or the wings of the stage after the tune was done.
Kelly's second performance really showed the range of his style and substance, as he delivered a remarkably beautiful and emotional performance of his song "Lonely."
Fans took to Twitter to gush over the numbers, and many said how they were brought to tears by his second appearance, given the significance of the tune's lyrics in relation to his father's death in July 2020.
After Kelly knocked both sets out of the park, the rocker inadvertently stole the spotlight during the closing moments, during the cast goodbyes, when Davidson, his longtime friend, came over to give him a hug.
In a moment of playfulness, Kelly decided to try and pick Davidson up, but their goofy hug brought the pair down hard, and both stars toppled off the stage to the surprise of the entire cast -- and the delight of fans.
Machine Gun Kelly tried to pick up Pete Davidson ABSOLUTELY ATE IT pic.twitter.com/nNXO9s4AZf— Ben Palmer (@benjpalmer) January 31, 2021
Saturday Night Live airs live coast-to-coast at 11:30 p.m. ET, 8:30 p.m. PT on NBC.