Princes William and Harry were spotted partying with scantily clad babes and inflatable willies, while celebrating the impending marriage of a pal.
They downed cocktails and shots and fooled around on a pier with blow-up penises at the stag of Thomas Van Straubenzee, 30, a friend of theirs from Eton, the Daily Star reported.
Straubenzee is set to marry Lady Melissa Percy, 25, at the Percy family seat Alnwick Castle in Northumberland.
The venue of the party Tonteria, the Mexican-themed bar in Sloane Square, is owned by another friend of the brothers, Guy Pelly.
After spending five hours at the party, William and Harry left the place at 1.30am.
