Despite splitting some months ago, Casper proved that himself and J.Lo - who turned 45 on Thursday (24 July) - are still friends.
He tweeted: "Happppppppy Birthday to the most beautiful lil bear in the world!!!! May all your wishes come true!! @JLo."
Casper then posted a photo of a pink bear, which is the same teddy bear cake that he presented to her as a birthday gift two years ago. And the reason he called her "bear"? Well, the former couple used to affectionately call each other that!
Responding to Casper's tweet today, Jennifer simply said: "@BEAUcasperSMART Thank you so much for my birthday wishes."
In June, it was reported that Jennifer and Casper had split after more than two years of dating. Sources said the break-up was "amicable" and the couple are still friends, but busy schedules was reportedly a large factor.
Following their break-up, Jennifer was romantically linked to Dancing with the Stars professional Maksim Chmerkovskiy.
'Live It Up' singer Jennifer has been showing off her amazing body and flawless skin in a handful of photos posted to Instagram over the past few weeks during a summer break.
Her birthday celebrations look to be in full swing too, as she spent it partying with pals in the Hamptons.
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Celebrity splits of 2014 in pictures:
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