It looks like these doubles partners earned themselves a score of Love-Love!
Sorry, we just couldn't resist!
Their love for tennis, that is!!
The newly engaged couple made their way to the Billie Jean King Tennis Center in New York to catch the action at the U.S. Open, and the two just could NOT stop smiling!
Maybe it has something to do with the small planet living on Katie's ring finger! That's some serious bling!!
Ch-ch-check a close-up pic of her HUGE RING AFTER THE JUMP and take a look at some other impressive engagement rings HERE!!!
[Image via Joel Ginsburg/WENN.]