Inside Celine Dion and Rene Angelil's Enduring 20-Year Love Story

Celine opens up about the heartbreaking battle she and her husband Rene are waging, again, against his throat cancer.

Celine Dion and husband Rene Angelil's 20-year marriage has gone through its fair share of highs and lows, from their opulent vow renewal to Rene's heartbreaking cancer battle. Now, ET is looking back at their incredible love story.

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Celine's bond with Rene goes beyond husband and wife. Rene, 26 years her senior, believed in her talent from the beginning and became her manager before she was 13.

"I went to his office and I sang in front of him and I was 12 years old, and we've been working together since that time," Celine recalled in 1995.

Despite the age difference, the two fell in love and wed in December 1994.

"I'm not surprised that we married each other, because we have the same dreams," Celine said in 1995. "We have the same goals. We respect each other."

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Their lives took a dramatic turn when Rene, 73, was diagnosed with throat cancer in 1999. Celine took off two years to take care of husband during this time and Rene underwent two operations and six weeks of radiation.

"When something like this happens to you it hits you so hard," Celine said at the time. "But I felt very strong because I said to myself, 'Rene needs me maybe for the first time in my life.'"

Rene was declared cancer free in 2000 and the couple renewed their vows at an Arabian nights-themed ceremony in Las Vegas.

Then in 2013, Rene received a devastating phone call.

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"I went back in my dressing room and I saw him looking pretty devastated and in shock, and I was like, 'What's going on?'" Celine told Good Morning America on Wednesday. "He sat down and said, 'The doctor just called me and I have cancer again.'"

Following this call, Rene had a tumor removed from his throat in December 2013. This caused Celine to again take an indefinite leave of absence from her career, which included a Las Vegas residency.

"I want to devote every ounce of my strength and energy to my husband's healing, and to do so, it's important for me to dedicate this time to him and to our children. I also want to apologize to all my fans everywhere, for inconveniencing them, and I thank them so much for their love and support," she said in a statement to ET in August 2014.

Celine's reps have announced that the singer will resume her residency at Caesar's Palace's Colosseum in late August, but she is still tenderly caring for her husband.

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"He can't eat so I feed him," Celine told GMA's Robin Roberts. "He's got a feeding tube. I have to feed him three times a day."

Celine and Rene have three children together: Rene-Charles, 14, and twins Eddy and Nelson, 4.