Miley's birthday party also featured a phallic-shaped mechanical bull, which the star is pictured riding

A source recently told Hollywood Life: 'Maria Shriver disapproves of the relationship that Patrick is starting with Miley,' they said. 'She is so controlling when it comes to the image of the family and this is eating her up inside.'

That could be because Maria's mother, Eunice Kennedy Shriver, was a sister of John F. Kennedy, Robert F. Kennedy, and Edward Kennedy.Read more »