[26M][28F] Double date idea with coworker… fun or creepy?

I recently looked up my coworkers name on Facebook, and found out she knows my girlfriend and we’re mutual friends.

They both went to same college, in same classes together based on what I found on her profile. That was 10 years ago.

I’ve never contacted my coworker outside of work before, but we are pretty close in work.

I was going to message her on Facebook, and invite her out for drinks with us. I told my girlfriend about the idea and she seems excited.

Does this sound fun or creepy if a random coworker found you on Facebook and messaged you?