The couple first announced that they would divorce only 16 days after they tied the knot in December.
O'Connor and Herridge attempted a reconciliation, but split again weeks later amid claims of media intrusion into their relationship.
The 'Nothing Compares 2 U' singer took to Twitter on Sunday (January 29) to reveal that she was again spending the evening with Herridge.
"Yay! I (am) sickeningly happy. Love me beautiful husband… He gone home to get his jammies (pajamas) and he comin back (sic)," she wrote.
O'Connor also tweeted that she was happy that she'd no longer have to spend nights alone.
The musician added: "yaaaaaaaaaaaaaayyyyyyyyy!!!!!!!!!!!!!!!!!!!!!!! snuggles evrey night for like.. ever.... and ever.. yaaay!!! No more snuggle-less-ness…"
Earlier this month, O'Connor asked for psychiatric help from her Twitter followers after revealing that she'd recently tried to commit suicide twice.
She eventually sought medical treatment for depression.
The musician told Oprah Winfrey in 2003 that she had been diagnosed with bipolar disorder.
> Sinead O'Connor split with husband over Twitter suicide plea
Watch Sinead O'Connor's 'Nothing Compares 2 U' music video below: