Apparently, those on this list didn't make it because of an isolated incident .. but rather repeated incidents.  

Katherine Heigl:  In addition to being a bad tipper, she's also a lousy customer . . . complaining about her food, sending it back multiple times and being extremely demanding.  She's worth $25 million.


Sean Penn:  He and some friends once ran up a $450 bill at a restaurant in New Orleans, then dashed without leaving SQUAT for the server.  He's worth $100 million.


Britney Spears:  She once threw change at the feet of a valet attendant and said, "There's your tip."  She also left a $26 tip on a $500 bill, which comes to 5%. 


And one time at a Vegas restaurant, she made the waiter run across the street and get her Starbucks.  She didn't tip him, or even reimburse him for the coffee.  And she's got an estimated $200 million in the bank.


Kirsten Dunst:  She once left NO TIP on a $223 bill . . . and after she left, the staff said she was whiny and smelled bad.  (???) Another time, a restaurant comped her entire meal and she STILL left no tip.  Even though she's worth $25 million.


Usher:  He's been known to leave AUTOGRAPHED PICTURES of himself instead of cash.  He has a net worth of $140 million. 


Rachael Ray:  Being in the food industry, you'd think she'd be a good tipper.  But she regularly tips less than 10%, and has even said on her TV show that 7% is GOOD ENOUGH.  Maybe that's why she has $60 million to her name.


Bill Cosby:  He's worth $350 million . . . but he once left a $3 on a $350 bill.  That's less than 1% tip.


Jeremy Piven:  He was banned from all Nobu Matsuhisa restaurants after he took 12 of his friends to one in Aspen in 2007.  Even though the place was packed and he didn't have a reservation, they got him a table.


He left the Season One DVD set of "Entourage" as a tip, and on the way out, he told the manager, quote, "Thanks for nothing."   Piven has a net worth of $15 million.


Madonna:  She's notoriously rude to waiters and often doesn't leave a tip at all.  One time she splurged and left an $18 tip on a $400 bill.  That's 4.5%.  She's worth $650 million.  Oh, and she used to be married to fellow bad tipper Sean Penn.


Tiger Woods:  While vacationing with a "mystery woman" in Las Vegas one time, Tiger stiffed his waiter . . . so the WOMAN left a tip.  Probably out of embarrassment.  Tiger has $500 million in the bank.


[ I can personally confirm Vegas table dealers often refer to him as "No Tip Tiger."]