Today's Celebrity Birthdays 4/6

Merle Haggard - age 71 - American country singer-songwriter and guitarist

Billy Dee Williams - age 71 - American actor best known as Lando Calrissian in "Star Wars"

Roy Thinnes - age 70 - American actor who played David Vincent on ABC's "The Invaders"

Barry Levinson - age 66 - Oscar-winning director, producer and screenwriter whose films include "Rain Man," "The Natural" and "The Perfect Storm"

John Ratzenberger - age 61 - American actor best known as Cliff Clavin, Jr. on NBC's "Cheers;" a recent contestant on ABC's "Dancing with the Stars"

Markku Lappalainen - age 56 - American actress, producer and author who portrayed Elaine Nardo on ABC's "Taxi"

Frank Black - age 43 - frontman of the alternative rock band Pixies

Paul Rudd - age 39 - American actor who starred in films including "Clueless," "Anchorman: The Legend of Ron Burgundy" and "Knocked Up"

Jason Hervey - age 36 - American actor and producer best known as Wayne Arnold on ABC's "The Wonder Years"

Zach Braff - age 33 - Amercan actor, director, producer and screenwriter who plays J.D. on NBC's "Scrubs;" wrote, directed and starred in the film "Garden State"

Candace Cameron - age 32 - American actress known for playing D.J. Tanner on ABC's "Full House"