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Now, it's reported that they are officially dating! To top it off, mother Victoria Beckham totally approves of Millie for her son.
Cute.
The Sun reports that it's "early days" for the pair.
"It's early days but they make a very sweet couple. Posh has given it the seal of approval as she is a big fan of Millie's."
Millie has always been a big fan of Romeo's, often talking about him on social media.
Once she was asked what she wants for her Stranger Things character Eleven on the show, she replied: "I don't know. Something with Romeo Beckham."
Get it girl.
