After being treated for dehydration, Richie heads out to dinner with beau Joel Madden in Beverly Hills. Plus: Madonna & Guy, Tom & Katie and more

PARTY CRASHER

Somehow we thought he'd be...less friendly. Whether she likes it or not, tennis champ Serena Williams has a new pal in the Grinch at the National Education Association's Read Across America party at the New York Public Library on Friday. The organization celebrated the 50th anniversary of Dr. Seuss's The Cat in the Hat.