Champion US filly Rachel Alexandra returns to action in the Mother Goose Stakes (G1) at Belmont Park in New York this Saturday.

The Steve Asmussen-trained filly will be racing for the first time since her win over Kentucky Derby winner Mine That Bird in the Preakness Stakes (G1) at Pimlico on May 16.

Rachel Alexandra (Medaglia d’Oro), who won the Kentucky Oaks (G1) by 20 lengths prior to her historic Preakness triumph, has won 8 of her 11 career starts for earnings of $1.6 million.  She became the first filly in 85 years to win the Preakness.

“She went beautiful this morning,” Asmussen said after the filly worked a half mile in 49.80s at Churchill Down on Monday.  “She looked very happy.”

Zenyatta will attempt to maintain her unbeaten record in California this Saturday when she starts in the G1 Vanity Handicap at Hollywood Park.

Zenyatta has won each of her ten career starts.  The only time she did not win by daylight was in the 2008 Vanity when she edged out Tough Tiz’s Sis by a half-length.

The five-year-old Street Cry mare opened her 2009 campaign with a comfortable victory over stablemate Life Is Sweet in the Milady Handicap (G2) at Hollywood Park on May 23.

Zenyatta is trained by John Shirreffs for owners Jerry and Ann Moss and was voted Champion older female in the US for 2008.

She warmed up for the Vanity with the fastest hit-out at Hollywood Park last Friday when reeling off 1200m in 1.12.60s.