Chris Brown -- I’m Giving Royalty All My Rides … Just Smaller Versions

Now we know why Chris Brown made these awesome mini-whips ... it was a birthday present for his 1-year-old daughter.

Chris had 3 cars specially made for Royalty's bday -- small versions of his own vehicles ... a Range Rover and 2 Lambos.

The small cars go for $2,500 a pop, but we're told Chris got the hook up from JC Customz in Bellflower, CA.

Each tricked out mini-ride has leather and suede interiors, custom rims, working headlights, and a paint job to match papa's.

Breezy’s daughter can start doing doughnuts in the driveway this weekend when they get delivered to her at Chris' L.A. house. It's a nice way to make up for daddy missing her birthday last month.