From the NY Post's Page Six showbiz and gossip section:

Sinead O'Connor has announced she has converted to Islam and changed her name to the Arabic word for martyr.

The "Nothing Compares 2 U" singer, 51, tweeted a picture of herself wearing a hijab.

Mom-of-four O'Connor was ordained a priest by a Catholic sect during the 1990s.

But the Irish singer has changed faiths and her name to Shuhada Davitt.

Sinead, who has struggled with mental health issues, told fans: "This is to announce that I am proud to have become a Muslim."

End

A quick note from Tim:

She was NOT ordained a priest by a Catholic sect. She was ordained by the Irish Orthodox Catholic and Apostolic Church, which is in no way associated with the Catholic Church. It's a sect with roots in eastern Orthodox Christianity, not Catholicism.  This is not an "Eastern Rite" faith in communion with the Catholic Church, but a schismatic entity fully outside of the Catholic faith.