According to a letter from the Office of Sacred Worship to Priests and Deacons of the Archdiocese of St. Louis:
The Office of Worship would just like to remind you that Friday March 25th is the Feast of the Annunciation of the Lord. This day is celebrated as a solemnity, and thus, in accordance with canon 1251 the penitential practice of abstinence is not to be observed on this particular day.
Canon 1251 reads: Abstinence from meat, or from some other food as determined by the Episcopal Conference, is to be observed on all Fridays, unless a solemnity should fall on a Friday. Abstinence and fasting are to be observed on Ash Wednesday and Good Friday.
This is a day meant for celebration and not fasting. We hope you all enjoy this special feast.