Bell, who dated Ryan in the mid-2000s, shared his heartbreak over the sad news in a series of tweets.
"I can not believe this is true!!!" the actor and singer first tweeted to his ex-girlfriend on Monday as news of her death spread.
"No no no!!!!" the former Drake & Josh star later posted to his own page, adding a photo of the onetime couple posing on the red carpet at the 2006 MTV Movie Awards. "I can NOT BELIEVE THIS IS HAPPENING!!!! Please wake me from this nightmare. @StevieRyan I loved you and will forever miss you!"
"This is too much," he continued in a second tweet. "My heart is crushed. @StevieRyan I love you and miss you..."
The Nickelodeon actor, who turned 31 on June 27, also retweeted one of Ryan's popular "Little Loca" sketches shared by Perez Hilton as a tribute. The video star was also famed for her impersonations of celebrities like Lady Gaga and Justin Bieber.
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