Davidson cracked a joke about the fact he's single during a promo for this weekend's 'SNL' -- asking musical guest Maggie Rogers if she wanted to get married.
Our sources connected to 'SNL' say Pete had been in good spirits while prepping for the show -- and was open to making jokes about jumping into relationships too soon.
So, that's what happened during the promo ... but Ariana Grande wasn't laughing -- she tweeted a shot at her ex.
"For somebody who claims to hate relevancy u sure love clinging to it huh. thank u. next."
She later deleted the tweet.