Jennifer Lopez' ex-boyfriend Casper Smart sent her a sweet birthday message on Twitter yesterday to celebrate her turning 45.

Casper Smart, who split from the singer a few months ago, referred to the 'On the Floor' hitmaker as a "beautiful little bear" as he wished her a happy 45th birthday on the social networking site. 

The choreographer posted a picture of a pink bear cake, which he had given Jennifer for her 43rd birthday two years ago, and accompanied it with the caption: "Happppppppy Birthday to the most Beautiful lil bear in the world!!!! May all your wishes come true!! @JLo (sic)."

Jennifer is yet to respond to Casper's heartfelt comment but is reportedly planning to spend her special day celebrating her milestone with her friends and family. 

A source told the MailOnline: "She's having a small, private party with friends and family."

Meanwhile, the stunning star believes she has got "smarter" about the choices she makes in her personal life since ending her two-year relationship with Casper.

Following the break-up, Jennifer was romantically linked to 'Dancing with the Stars' professional Maksim Chmerkovskiy, but he insists their relationship is nothing more than close friends. 

The sexy superstar is now focusing all of her attention on her six-year-old twins Max and Emme - whose father is her third husband Marc Anthony - as she wants to give them the best possible life.

She said previously: "I want to give them the best life. You want them to have everything, you want them to grow up and have everything better than you had it."