Sinead O'connor and Barry Herridge

Sinead O'Connor is redefining the "on-again, off-again" relationship.

Sinead O'Connor marries boyfriend in Las Vegas

Just after Christmas the singer announced on her website that she and husband-of-16-days Barry Herridge, had split. But now — the two are back together. This time she took to Twitter to share news of the reunion.

"Guess who had a mad love making affair with her own husband last night?" O'Connor tweeted.

Sinead O'Connor and husband split — after 16 days

Herridge is O'Connor's fourth husband. The two were married in Vegas in early January, but the 45-year-old singer announced their split just two weeks later, writing, "It became apparent to me that if he were to stay with me he would be losing too much to bear. ... And a woman wants to be a joy to her husband. So ... U love someone? Set them free ... He is, as I said, a wonderful man. We part amicably."

Do you think O'Connor and Herridge are back together for good this time?