Seacrest's New Chick Scores HUGE Modeling Contact : Thanks to Ryan Hookup

Ryan Seacrest still has the Midas touch ... 'cause his sexy new rebound chick just inked a deal with one of the biggest modeling agencies on the planet .
It has been learned Shayna Taylor ... a.k.a Ryan's hot new blonde ... signed a 2-year deal with Wilhelmina Models yesterday .
We're told Shayna's Instagram BLEW UP with a few followers following the Thanksgivng holiday she spent with Ryan and his family in Argentina ... and the modeling agency took notice .
Plus she's really hot ...

A rep for Wilhemina tells us they believe Shayna has "huge potential in the fitness and lifestyle world."
Shayna is publicly saying ahe and Ryan are just friends ... but c'mon ... what kind of friends travel around the world together with Seacrests parents .
Especially when one of the friends looks this damn hot in a bikini .