Jennifer Hudson has acknowledged Whitney Houston's death has really taken a toll on her emotionally.

The former third-season American Idol finalist sang a rendition of Houston's classic "I Will Always Love You" at the Grammy Awards Sunday night as a tribute to the 48-year-old singer who had passed away the day prior, and Hudson -- who choked up mid-performance and then cried following its completion onstage -- said the tears have been flowing ever since she learned of the tragic news.

"It was the greatest honor of my life to be able to be the one to pay tribute to Whitney's memory," the 30-year-old singer and actress told Us Weekly.

"It was from my heart. I haven't stopped crying since she passed. Her family is in my prayers."

Houston, the former Being Bobby Brown co-star who was being eyed by The X Factor creator and judge Simon Cowell to become a member of the reality singing competition's second-season judging panel shortly before her sudden death, was found dead in her hotel room on Saturday afternoon.

The cause of Houston death has yet to be confirmed.