Rachel Alexandra in foal with filly

LEXINGTON, Ky. -- Rachel Alexandra, the 2009 Horse of the Year who gave birth to her first foal in January, is expecting again.

Stonestreet Farm announced the news in a tweet Saturday: "IT'S A GIRL!!!!"

The tweet says Rachel is in foal to Bernardini with a filly.

Rachel had a bay colt in January after being bred to two-time Horse of the Year Curlin.

Rachel was the first filly in 85 years to win the Preakness in 2009. She finished with 13 wins and five second-place finishes in 19 starts.