Lil Wayne -- Birdman Pays Weezy a Visit

Lil Wayne's latest hospital visitor was perhaps his most important: his mentor ... Birdman.

The rap stars are as close as close can be, so much so that Birdman calls Wayne "his son." Birdman famously gave Wayne $1,000,000 in cash on his 26th birthday.

Wayne -- who has been in the hospital since suffering multiple seizures earlier this week -- has also received visits from Drake and Los Angeles Clippers star Chris Paul.