Check out the Hostelworld "Even Divas are Believers" extended commercial with Mariah Carey!<br /><br />What's your favorite commercial of all time? Join the conversation!<br /><br />Legendary diva Mariah Carey has taken a break from her lavish lifestyle to join backpackers on a recent trip to Barcelona where she had her first hostel experience, at the luxe Casa Gracia. Check out the video to see what went down.
