Because the Cleveland Cavaliers have a really big team and they have some really big rings.

And Tristan Thompson was all too proud to show off his new bling off with girlfriend Khloe Kardashian on Tuesday night, fresh off the Cavs' 117-88 thrashing of the New York Knicks in Cleveland.

Before the season-opening game, the Cavs were presented with their championship rings during an on-court ceremony.

Look at the rock sitting on Thompson's hand — not to mention, all the diamonds on Khloe's ring finger.

Khloe was in attendance for her boo's special night at Quicken Loans Arena in The Land.

And she was super proud of her man, Snapchatting his personalized Moet champagne bottle and the Cavs' championship trophy.

The support comes days after Tristan congratulated Khloe on her new women's jeans line by filling their home with balloons and cake.

These two are getting pretty serious despite Thompson and his pregnant ex, Jordan Craig, expecting a child.

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