It's a collaboration of titanic proportion. A-list actor Leonardo DiCaprio is teaming up with Swiss watchmaker Jaeger-LeCoultre to raise money for his charity and to celebrate the luxury brand's 175th anniversary.

Environmental programs associated with The Leonardo DiCaprio Fund at the California Community Foundation will benefit from proceeds from the sale this fall of two super-expensive watches, the first in two limited series of watches to feature new technology.

The Master Compressor Extreme Lab style, worn by Mr. DiCaprio to the premiere of his documentary "The 11th Hour," is valued at $300,000. It's crafted in carbon fibers and titanium; features an automatic tourbillon, two time zones and Mr. DiCaprio's engraved signature; is resistant to temperatures as low as minus 40 degrees and as high as 60 degrees Celsius; and features the first mechanical movement to operate without lubricant.

The other style, a platinum edition of the Reverso Gyrotourbillon 2, is valued at $400,000. It features the first spherical tourbillon, a 50-hour power reserve, a cylindrical balance-spring with end curves and more than 370 other parts.

The timepieces will be sold at Jaeger-LeCoultre Boutiques, scheduled to open in Beverly Hills, Calif., this fall and Boca Raton, Fla., later this summer.

Model search

The Junior League of Pittsburgh is recruiting models for the local American Girl Fashion Show. Models must fit a size 6 for Bitty Baby outfits or size 10 for historical and "Just Like You" fashions. Auditions are 10 a.m. to 2 p.m. Aug. 2 at Carnegie Mellon University in Oakland and Aug. 9 and 10 at Barnes & Noble at the Waterfront in West Homestead.

Applications can be downloaded at jlpgh.org. About 150 models will participate in five fashion shows scheduled for 10:30 a.m. and 1:30 and 4:30 p.m. Nov. 1 and 1 and 4 p.m. Nov. 2 at the Pittsburgh Field Club in Fox Chapel. The event will have a party-like atmosphere with refreshments and door prizes. Proceeds benefit the Felician Sisters' Mooncrest Children's Program, Kids in the Kitchen and other children's charities.

Fashion Agenda

Today through July 30: Gurhan and Roberto Coin fine jewelry trunk shows at Saks Fifth Avenue, 513 Smithfield St., Downtown. Also, antique and estate jewelry trunk show through Aug. 7 featuring rare and collectible pieces by Fred Leighton, Cartier, Van Cleef & Arpels, Mauboussin, Boucheron, Smithwick Dillon and others. Call 412-297-5359 for more information.

Sunday: The seventh annual National Miss Black Teen Pageant is at 2 p.m. at the Radisson in Monroeville. Tickets are available by calling 412-224-4023. Admission at the door ranges from $20 to $30. Entertainers include singer Terri Bercelli and baton twirler Page Weinstein, Junior Teen Miss Pittsburgh 2008.