Britney Spears Shacks Up with Sam Asghari in $15k-A-Night Hotel Suite in Las Vegas

Britney Spears spared no expense on a weekend getaway to Sin City with her fiancé Sam Asghari ... shacking up in a lavish hotel suite with its own backyard and pool!!! Britney went all out for a two-night stay at Resorts World Las Vegas ... where…