Peeress is a chestnut mare with a faint white star bred and raced by David and Patricia Thompson's Cheveley Park Stud.

[2] Peeress's dam, Noble One, by the sprinter Primo Dominie won two minor races over five furlongs but failed when moved up to Listed class.

Peeress was off the course for three months after her defeat at Goodwood and was then moved up in class for the Listed Fleur de Lys Stakes at Lingfield Park Racecourse.

Racing on a Polytrack surface for the first time, she finished fourth of twelve runners, after her jockey Darryll Holland had been unab;e to obtain a clear run in the straight.

Ridden by Mick Kinane she started the 13/8 favourite and recorded her most important success up to that time as she won "readily" by two and a half lengths from Dumnoni.

[8] At Epsom Downs Racecourse in June she was moved up to Group Three class for the Princess Elizabeth Stakes but was beaten two lengths by the Godolphin filly Sundrop: Stoute later stated that she was unsuited by the course.

[9] The "Royal Ascot" meeting of 2005 was transferred to York, where Peeress was promoted to Group Two class for the Windsor Forest Stakes, in which her opponents included Sundrop, Soviet Song and Airwave.

On 1 October, Peeress, ridden by the veteran Kevin Darley started at odds of 7/1 for the Group One Sun Chariot Stakes over the Rowley Mile course at Newmarket.

[13] Two weeks later, Peeress was moved down in distance for the Challenge Stakes at the same course and, carrying a four pound weight penalty for her Group One win, finished fourth of the fifteen runners behind La Vie dei Colori.

"[16] At Royal Ascot, Peeress started favourite for the Queen Anne Stakes but finished fourth to the colt Ad Valorem, having been bumped by the winner inside the final furlong.

[20] In May 2007, Peeress, now a six-year-old, attempted to repeat her 2006 victory in the Lockinge Stakes, but despite starting favourite, she ran disappointingly, finishing seventh of the eight runners behind Red Evie.