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Robin Gibb, Donna Summer

Robb D. Cohen/ PictureGroup via AP IMAGES

The Billboard Music Awards hit a somber note on the carpet today in Las Vegas, as celebs reacted to the news that Bee Gees singer Robin Gibb died this morning—he was 62.

His passing comes just three days after disco legend Donna Summers lost her own battle to cancer at 63-years-old.

So on the night set to honor music's biggest stars of today, E! News caught up with celebs on the red carpet to hear their thoughts on the passing of two music legends.

"It's sad, they made great music," Taio Cruz told E! News.

"It's horrible," echoed Gavin DeGraw.

"It's sad when people who have been influential pass away—they definitely left a legacy," Carrie Underwood said.

"It's sad and it hurts. They were legends, we're blessed to have their music, their music will never die," Brandy told E! News.

"Love and respected them. As you get older, that becomes more reality," Kris Kristofferson said.

"It's something you can't describe, it's unexpected," Monica said.

In addition to the surprised and sad sentiments, hosts Ty Burrell and Julie Bowen also took a moment during the show to pause and remember Gibb.

Keep checking back for more celeb reactions to the passing of the two music sensations.