Whitney Houston

Is Whitney Houston's voice shot?

On her highly anticipated comeback performance on Wednesday's Good Morning America, Houston struggled to sing "I Look to You," her voice cracking in several spots. In a shocking turn of events, she blamed Oprah Winfrey.

"I'm so sorry. I did Oprah. I've been talking for so long. ... I talked so much, my voice," she told the crowd in New York City's Central Park. "I shouldn't be talking. I should be singing."

Get the details on Houston's Oprah appearance

Watch the apology below:

The Grammy-award winning diva dedicated her performance to her mom, gospel legend Cissy Houston. Check out the video here (at the 1:27 mark) to hear for yourself.

According to Houston's rep, the singer was only committed to sing two songs because her voice was strained after her interview with Winfrey, but instead delivered four. "She's a trouper. The crowd loved her and she loved singing for her fans — she had such a great time."

An email sent The Oprah Winfrey Show's publicist was not immediately returned to TVGuide.com.

Watch Houston's classic music videos

Houston's set also included the new single "Million Dollar Bill" and her classic hits "I'm Every Woman" and "My Love Is Your Love," which she performed with daughter Bobbi Kristina Brown.

After the performance, Houston reunited with Diane Sawyer — seven years after her "crack is wack" interview with the news anchor.

"Seven years ago, looking in each other's eyes. It was a very different world then," Sawyer said to Houston. Watch the video here.

What did you think of Whitney's comeback performance?