Star Tracks - Monday, September 25, 2006

Oprah Winfrey is practically dancing in the street as she and best friend Gayle King leave NBC Studios in New York City on Monday. And Winfrey has every reason to celebrate: The media mogul just expanded her Harpo empire to include her own radio channel called Oprah amp Friends on XM Satellite Radio.

Jennifer Aniston takes her dog-walking duties seriously Sunday, keeping a short leash on her frisky new pup while faithful canine companion Norman and one of pal Courteney Cox’s Cavalier King Charles spaniels get free reign in Malibu.

Jessica and Ashlee Simpson make the rounds – separately – over the weekend in London. Ashlee (left) gets dialed into the theater world Saturday in preparation for her West End debut as vixen Roxie Hart in Chicago. And Jessica – who’s in town to cheer her sister on at Monday’s opening night – attends a London Fashion Week party on Friday.

And she’s off – again: Chic traveler Jessica Simpson arrives at Los Angeles International Airport Thursday for a flight to London.

Tom Cruise and fiancée Katie Holmes take time out for a romantic huddle at son Connor’s Saturday football game in Pasadena while the rest of the family (left, daughter Isabella, 13, and mom Mary Lee, behind Cruise) keep score.

With matching messenger bags, Hilary Swank and longtime agent John Campisi stay in step during an outing in the Pacific Palisades on Saturday. The pair, who have grown close since Swank’s split from Chad Lowe in January, were spotted on a romantic Roman vacation late this summer.

Paris Hilton gets in touch with her inner Bavarian barmaid Monday in Munich as she serves up a little celebrity advertising power: The heiress is in Germany to promote the sparkling wine Rich Prosecco – and matched her glittery take on the dirndl (the traditional German dress) with the wine’s gold can.

Donny Osmond channels his inner brute Sunday as he takes over the role of buffoonish villain Gaston in Broadway’s Beauty and the Beast, which he will play through November.

Debra Messing is still feeling festive in a bright frock – one she wore a year ago upon her return from Cabo San Lucas (inset) – as she and husband Daniel Zelman touch down at Los Angeles International Airport on Friday after vacationing south of the border.

Beyoncé looks positively dreamy as she arrives in Paris on Friday. The singer-actress, who’s in town promoting B’Day, also made an appearance on a French reality-TV show called Star Academy.

Janet Jackson let’s boyfriend Jermaine Dupri eat cake – and lots of it – at a Hennessy Paradis-sponsored birthday bash at music producer Quincy Jones’s Bel Air, Calif., home on Thursday. “We’ve been working a lot so we’re looking forward to having fun,” Jackson told PEOPLE at the party.

Nip/Tuck‘s newest cast member Sanaa Lathan (who was also celebrating a birthday) joins Meagan Good and Gabrielle Union for three times the good cheer at Dupri’s birthday bash.

Bono takes an opposing view from his U2 bandmates Larry Mullen Jr. (left) and The Edge as the rockers sit down to a really good read – their autobiography U2 by U2 – at a London bookstore on Friday.

Nicole Kidman wears a serious look to match her all-business attire on the London set of her fantasy film, His Dark Materials: The Golden Compass, on Thursday.

Reese Witherspoon may be dressed for fall, but the actress is still getting the scoop on summer as she goes on an ice cream run Thursday in Brentwood, Calif.

A preppy Meg Ryan hits the books – sort of – as she stocks up on reading material at a Brentwood, Calif., newsstand on Friday.