The Keystone State Boychoir, leaving next week for its first European tour, will meet

Prince Albert

in Monaco as the guest choir of the annual Fête de la Musique. One choir boy is

Nick Kelly

, 15, and if the Kelly name surrounding Monaco sounds true, well: His father,

John B. Kelly III

, is a first cousin of the prince, which makes the late

Princess Grace

an aunt. Besides Monaco, the boys will hit France, Germany, Austria and Bulgaria, and in addition to scheduled performances at Disneyland Paris and in the Salzburg Cathedral, they're to sing on July 4 at the U.S. Embassy in Vienna. The choir's "bon voyage" performance will be 12:30 p.m. June 18 at the Church of the Holy Trinity on Rittenhouse Square.

Dude selling his home

Ballplayer turned investor

Lenny Dykstra

is selling his eight-bedroom mansion in Thousand Oaks, Calif. - the one he bought last year from

Wayne Gretzky

. Dykstra, who lived rather modestly in Wayne during his days with the Phillies, is asking $24.9 million. (See the listing and photos at

.) Real estate blogger Big Time Listings broke the news Sunday.

Wedding bells

Ye old power couple

Ralph Archbold

and

Linda Wilde

- the city's best-known Ben Franklin and Betsy Ross - have announced their wedding plans: a public ceremony on July 3 at 8 p.m., in front of Independence Hall with

Mayor Nutter

performing the service and

Peter Nero

and the Philly Pops concertizing. It'll be part of Sunoco Welcome America.

The circuit

Comedian

Billy Crystal

was among the first to bunk at the new Water Club, the luxe Borgata offshoot in Atlantic City. He ate at Borgata's Ombra restaurant and later Saturday visited mur.mur nightclub, where model-DJ

Sky Nellor

marked her birthday party; among guests were actor-singer

Tyrese Gibson

, WFAN host

Craig Carton

, Philly's

Alycia Lane

and

Chris Booker

, and Fox29's

John Bolaris

.

Transformers 2 director Michael Bay and costar Megan Fox attended a start-of-shooting party Sunday night at 10 Arts, the swank restaurant in the lobby of the Ritz-Carlton. Also there were Mayor Nutter with wife Lisa and daughter Olivia. The company, which shot yesterday at Cappuccio's Deli in South Philly, will be here for two weeks.

Briefly noted

Today's planned noontime pretzel giveaway at Love Park on JFK Boulevard, in conjunction with the Olympic gymnastics trials, has been postponed due to heat. (They were afraid they'd get too well-done, sitting outside?) It's rescheduled for next Tuesday.

There's a twist this year to the "World's Largest Bubble Bath" promotion on WIP-AM (610), in which a dozen women in bikinis will hunt for plastic eggs filled with prizes Thursday morning among the soap suds filling the showroom at Steven Singer Jewelers at Eighth and Walnut Streets. Five men will wear itsy-bitsy bathing suits while they plunge in to search for an engagement ring; expectation from Angelo Cataldi and crew is that the finder will propose to his girlfriend on the spot.

Brad Maybe? Yes, the onetime producer of Chris Booker's and Kidd Chris' radio shows has been trying out for a weekend air job at WRFF-FM (104.5).

WOGL-FM (98.1) staff will formally dedicate the main WOGL studio on Friday as "the Big Ron O'Brien Studio" in honor of the afternoon DJ who died April 27.

Good Morning America weather anchor Sam Champion will do his thing tomorrow from the Philadelphia Zoo and the Zooballoon. As for Thursday, the zoo will stop selling tickets at noon and shoo humans out at 2 p.m. because of that night's Zoobilee fund-raiser.

Saturday will be Jonny Meister Day in Media, during the borough's State Street Blues Stroll. Meister is being honored on the 30th anniversary of his blues show on WXPN-FM (88.5).

Contact columnist Michael Klein at 215-854-5514 or mklein@ phillynews.com. See his recent work at http://go.philly.com/michaelklein.