Peter Sydney Ernest Aylen (7 September 1923  – 24 December 1984), better known as Peter Lawford, was an English-American actor.

He was a member of the "Rat Pack

Rat Pack

The Rat Pack was a group of actors originally centered on Humphrey Bogart. In the mid-1960s it was the name used by the press and the general public to refer to a later variation of the group, after Bogart's death, that called itself "the summit" or "the clan," featuring Frank Sinatra, Dean...

", and brother-in-law to US President John F. Kennedy

John F. Kennedy

John Fitzgerald "Jack" Kennedy , often referred to by his initials JFK, was the 35th President of the United States, serving from 1961 until his assassination in 1963....

, perhaps more noted in later years for his off-screen activities as a celebrity

Celebrity

A celebrity, also referred to as a celeb in popular culture, is a person who has a prominent profile and commands a great degree of public fascination and influence in day-to-day media...

 than for his acting. In his earlier professional years (late 1930s through the 1950s) he had a strong presence in popular culture and starred in a number of highly acclaimed films.
Born in London in 1923, he was the out-of-wedlock child of Sir Sydney Turing Barlow Lawford

Sydney Turing Barlow Lawford

Lieutenant-General Sir Sydney Turing Barlow Lawford, KCB was a British Army officer, and the father of movie star Peter Lawford.-Biography:...

 and May Somerville Bunny.