The centre-half will join City on a three-year-deal from 1 July following the conclusion of her current contract at Atletico Madrid.
Still only 21, Aleixandri was named by UEFA as one of the ten most promising young players in Europe, and she joins the Club having won two league titles during her time in the Spanish capital.
Having made her international debut for Spain in 2019, the defender is set to feature at the European Championships this July alongside fellow new signing Leila Ouahabi.
Our third signing of the summer, Laia posed for photos having put pen to paper on her move to the Academy Stadium and was even joined by her former Atletico Madrid team-mate Deyna Castellanos, who signed last week.
Check out the best images from the day via the gallery below...