In a large bowl, with a hand or stand mixer, cream together sugar and butter on low speed. Mix until well blended. Increase speed to medium and beat for another 3 minutes.
Add vanilla, cream and Bubbly continue to beat on medium speed for 1 minute more, adding more Bubbly if needed for desired spreading/piping consistency.
Scoop into a piping bag and pipe decoratively onto cupcakes, or spread onto cupcakes as desired.