Stacelita began her career with six straight wins including the Group I Prix Saint-Alary, Prix de Diane and Prix Vermeille, the latter as a result of the disqualification of Dar Re Mi. She finished her three-year-old campaign with a seventh-place finish in the Prix de l'Arc de Triomphe behind Sea the Stars after setting the early pace. She began 2010 by finishing fourth in the Prix d'Ispahan behind Goldikova. She then won La Coupe at Longchamps before finishing second to Midday in the Nassau Stakes at Goodwood in her first trip outside of France. On 22 August, she won the Group I Prix Jean Romanet by a head over Antara but then finished second in the Prix de l'Opera to stablemate Lily of the Valley. She finished the year by finishing eighth in the Hong Kong Cup behind Snow Fairy. Stacelita began her five-year-old campaign in France by finishing third in La Coupe on 13 June 2011. She was then shipped to America for the Grade IUnited Nations Stakes on 2 July, but finished third behind Teaks North. Moved to the barn of trainer Chad Brown, she won the Beverly D. Stakes on 13 August by lengths over Dubawi Heights. "I had an absolutely wonderful trip," said jockey Ramon Dominguez. "I was able to sit right off the leader. Nice and relaxed, comfortable fractions. Turning for home, once I found a seam on the rail, I had to go for it and she reached for it great." Stacelita returned to win the Flower Bowl Invitational on 1 October before finishing a disappointing tenth in the Breeders' Cup Filly & Mare Turf in the final race of her career. Despite that loss, Stacelita was named the 2011 Eclipse Award winner as champion female turf horse, winning 158 of 211 votes.
Stacelita was sired by Monsun, who won the Europa Preis twice as a racehorse and became the leading sire in Germany four times. Monsun was at the forefront of a "renaissance" for German breeding, helped by the fact that his pedigree represented an outcross for the "ever-increasing saturation of Northern Dancer" in European bloodlines. Known for their stamina and soundness, German-breds made their first major impact in Europe through Urban Sea who was out of the German-bred mare Allegreta. Urban Sea won the Prix de l'Arc de Triomphe and became the dam of leading sireGalileo and his half-brother Sea the Stars. At the time of his death in 2012, Monsun was the sire of 108 stakes winners around the world, including Breeders' Cup Turf winner Shirocco. Stacelita's dam Soignee was sired by Dashing Blade, a descendant of Mill Reef. Soignee's dam Suivez descended from Northern Dancer on her sire's side and from the influential German mare Schwartzgold on the dam's side. This family has produced multiple stakes winners around the world including American champion turf male Steinlen, Irish Derby winnerZagreb and French champion Sagace.
