As revealed by the singer herself earlier this week, O'Connor tied the knot on her 45th birthday yesterday (December 8) at the Little White Wedding Chapel.
O'Connor wore a strapless pink dress for the ceremony and the newlyweds left the venue in an open-top pink Cadillac.
The 'Nothing Compares 2 U' star dated Herridge for three months after meeting him online, with the therapist apparently proposing to her on every date they went on.
The Irish musician has previously been married three times, last divorcing Steve Cooney in April after less than a year.
O'Connor is currently working on her ninth studio album How About I Be Me And You Be You, which is set for release next year.
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Watch Sinead O'Connor in the video for 'Nothing Compares 2 U' below: