Jennie Garth and Tori Spelling to co-star in ABC Family pilot

Actresses Tori Spelling, left, and Jennie Garth pose backstage at the Heart Truth Red Dress Collection 2009 fashion show during Mercedes-Benz Fashion Week at The Tent in Bryant Park on Feb. 13, 2009, in New York.
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It'll be a "Beverly Hills, 90210" reunion for Jennie Garth and Tori Spelling at ABC Family.

The actresses will co-star and executive produce the cable network's new series "Mystery Girls," it was announced Monday.

Spelling and Garth will play Holly and Charlie, former co-stars of a popular '90s crime-solving series. Spelling's Holly opens a detective agency and persuades Charlie, now a suburban mom, to help.

"Mystery Girls" is scheduled to shoot in November.

Spelling, 40, and Garth, 41, remained on the original "Beverly Hills, 90210" for its entire 10 seasons.

Garth was featured on the first two seasons of the recent CW "90210" spin-off, while Spelling guest-starred in two episodes.