Wonderful Tonight is a dark bay or brown filly with a white snip bred in France by a partnership headed by the Ecurie La Cauviniere.

She was sired by Le Havre, who won the Prix du Jockey Club in 2009, and whose other foals have included Avenir Certain, La Cressonniere and Suedois (Shadwell Turf Mile Stakes).

Wonderful Tonight began her second campaign by running fourth in the Listed Abingdon Stakes over ten furlongs at Newbury Racecourse on 13 June.

[7] On 13 September Wonderful Tonight was stepped up to Group 1 class for the first time to contest the Prix Vermeille over 2400 metres at Longchamp in which she was matched against older fillies and mares and came home fifth of the ten runners, four lengths behind the four-year-old winner Tarnawa.

"[10] Two weeks after her win at Longchamp Wonderful Tonight started the 4/1 favourite for the British Champions Fillies and Mares Stakes over one and a half miles at Ascot Racecourse.

Ridden by William Buick Wonderful Tonight tracked the leader Manuela de Vega before gaining the advantage three furlongs out and won by two and a half lengths from Dame Malliot.