"Jennifer had planned a fun day to celebrate Casper's birthday," a source tells PEOPLE. And the day began with a four-wheeled birthday present: a customized white Dodge Ram truck.
More from YourTango: Couple Alert? Tom Cruise Is Reportedly Dating This TV Actress
Lopez "knew that Casper really wanted a truck, and Casper was very excited about the generous gift," says the source.
Lopez also Tweeted: "@BEAUcasperSMART 'Beau has a birthday we're so glad...
Read more on People.com: Jennifer Lopez Spoils Beau Casper Smart With A Big Birthday Gift
More from YourTango: A-List Links: Heidi Klum Bares It All Vacationing In Mexico
More from People.com:
- Anne Hathaway Steps Out With Super Short Hair
- Heidi Klum Files For Divorce From Seal
- Amanda Bynes Spotted Post-Jail Release
Photo Credit: Getty