Music Star Hookups & Breakups

MARRIED: Sinead O'Connor and Barry Herridge
Irish singer O'Connor tied the knot with therapist Barry Herridge on Dec. 8, 2011 -- her 45th birthday -- in a drive-thru ceremony in Las Vegas.

Kabik/Retna Digital

Sinead O'Connor's roller coaster marriage appears to be back on.

After announcing the end of the union 18 days after her Las Vegas ceremony in December, the singer and husband Barry Herridge are working it out, according to O'Connor's Twitter page.

"Guess who had [sic] a mad love making affair with her own husband last night?" she tweeted on Wednesday. "We decided to be boyfriend and girlfriend again an stay married."

Asked by a fan, "Does that mean you aren't getting divorced now?" she responded, "Yup that's wot it means.

"An I can add to my lingerie collection," she added, before revealing, "Size uk 12 btw for anyone wanting to send any."

Last month, O'Connor announced the dissolution of the marriage thanks to "the behaviour of certain people in my husband's life… it became apparent to me that if he were to stay with me he would be losing too much to bear."