MADRID (AP) - Judicial authorities in Spain say pop music star Shakira is under investigation for possible tax evasion during the three years before she officially moved to Barcelona.

Shakira switched residences in 2015 from Bahamas to Barcelona, where she lives with her partner, Barca soccer player Gerard Pique, and the couple's two sons.

Tax authorities suspect the singer already lived in the northeast city between 2012 and 2014, when she allegedly failed to pay income taxes in Spain.

Prosecutor Jose Miguel Company said Tuesday that Spanish tax authorities referred the probe to the Barcelona prosecutor's office in December. He said a decision is expected by mid-June.

Anna Forastier, a spokeswoman for auditing firm PwC, said the company has been hired by Shakira for the investigation but declined to disclose any details.