Andy Cohen is offering a mea culpa to Kate Middleton for fueling conspiracy theories about her weeks-long absence after abdominal surgery before she announced she had been diagnosed with cancer.

Cohen came under fire last month, with many calling on him to apologize, after he questioned Princess Kate’s whereabouts and remarked on a video released by TMZ claiming to show the princess out with husband William.

“That ain’t Kate….,” Cohen wrote shortly after the video was posted.

He also had fueled Prince William affair rumors.

Cohen apologized today about his remarks on SiriusXM’s Radio Andy, his first show since Middleton made the shocking health announcement. He told his listeners “I just want to say, I am heartbroken by the news about Princess Kate,” adding “I think someone on Sky News called me a ‘numpty’ during that whole conversation and they were right.” He then admitted he wished he kept his “mouth shut” before noting, “We are all praying for Princess Kate and King Charles.”

Catherine, Princess of Wales, announced in a video message March 22 that she has been diagnosed with cancer and is undergoing chemotherapy.

“In January, I underwent major abdominal surgery in London, and at the time, it was thought that my condition was noncancerous. The surgery was successful,” she said in the video message. She then said tests after her operation in January found that cancer “had been present.” She said it has “taken me time to recover from major surgery in order to start my treatment,” and has taken her “time to explain everything” to children George, Charlotte and Louis.”

Middleton called for “time, space and privacy” while she completes her treatment.