Now THIS would be an odd couple!

Ariana Grande's ex Pete Davidson, 25, was reportedly hitting on English actress Kate Beckinsale, 45, at the Netflix Golden Globes after-party -- what?!

Davidson arrived with his bestie Machine Gun Kelly (see their hilarious Insta-video of how they started the night, below) and quickly separated so Davidson could get his mack on with Beckinsale. According to People magazine, the two "talked intently for most of the night before they were joined by Kelly, Isla Fisher, and Sacha Baron Cohen."

Another report claims Davidson was overheard asking Kelly, "What about that girl from before?" as they made their way into another after-party, according to ET.

You might think Kate wouldn't go for such a young dude, but au contraire! She recently broke up with boytoy Matt Rife who is a young 22!!! So really, she's aging up with Pete ...

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they regret the invite.

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