Could Tim Tebow's days as an unmarried man be numbered?!?!
Certainly seems that way ... 'cause the ex-NFL superstar brought his Miss Universe girlfriend to the Tebow Family Thanksgiving -- a sure sign that things are getting THAT serious.
Tim and Demi-Leigh Nel-Peters -- Miss Universe 2017 -- have been dating for a while now ... and they've been getting super cozy with each other the last few months.
Remember ... the South African model wished him a very public "happy birthday" back in August AND the two had a date day in New York with DLNP's fam in September.