NEWARK, N.J. -- A reputed mobster admitted assaulting the then-boyfriend and now husband of a former “Real Housewives of New Jersey” cast member in exchange for a deeply discounted lavish wedding reception.John Perna, 43, of Cedar Grove, New Jersey, pleaded guilty Wednesday to a federal charge of committing a violent crime in aid of racketeering activity.Prosecutors allege the former husband of cast member Dina Manzo, Thomas Manzo, hired Perna to assault his ex-wife's then boyfriend.