last year's model
Recent ex-girlfriend or boyfriend.
Tom and Jill are at the grocery store when Tom's ex-girlfriend Brady shows up:
-Hi Tom! How are you doing?
-I'm fine, thank you! Brady, this is my girlfriend Jill.
-Hi Jill! I'm Brady, last year's model.
<ensuing awkwardness>
-Hi Tom! How are you doing?
-I'm fine, thank you! Brady, this is my girlfriend Jill.
-Hi Jill! I'm Brady, last year's model.
<ensuing awkwardness>