Soul-pop legend Diana Ross will unite with two former members of the Supremes for a summer tour beginning in Philadelphia on June 14.

Ross will make the official announcement Tuesday at a press conference at Grand Central Terminal's Vanderbilt Station in New York.

The Supremes became Motown's defining group with such smashes as "You Can't Hurry Love" and "You Keep Me Hangin' On." Ross' cooing lead vocals became the trademark of the group's sound.

In 1969, after more than 10 years with the Supremes, Ross went on to solo stardom. Her hits in the next decade included the #1's "Ain't No Mountain High Enough," "Touch Me in the Morning," "Do You Know Where You're Going To?" (from her film "Mahogany") and "Love Hangover."

The Supremes were inducted into the Rock and Roll Hall of Fame in 1988.

It won't be a reunion, as Ross will be joining forces with Lynda Laurence and Scherre Payne, who joined the Motown group long after Ross' departure in 1969. Mary Wilson, who sang with Ross on Supremes hits such as "Come See About Me" and "Stop! In the Name of Love," will not appear on the tour. The other original Supreme, Florence Ballard, was dismissed from the group in 1967 and died in 1976.

Ross will be honored in this year's installment of VH1's popular "Divas" television show, which will be called "A Tribute to Diana Ross." Country singer Faith Hill, R&B-pop vocalist Mariah Carey and disco singer Donna Summer will appear with her on the show, to be televised April 11. Ross' most recent album, Every Day Is a New Day, was released in 1999. (sonicnet.com's parent company, Viacom, also owns VH1.)