Scarlett Johansson debuted her romance with Sean Penn at Reese Witherspoon's wedding on Saturday (26th March 2011).Scarlett Johansson, the American actress who is allegedly dating Sean Penn, was "terrified" after the couple's appearance at Reese Witherspoon's wedding was met with 'stares', reports US Weekly Magazine.Although the couple were photographed on a recent trip to Cabo San Lucas in Mexico, the wedding represents the first time that they have gone public with their romance. Amongst the guests at Witherspoon's big day were Renne Zellweger, Matthew Mcconaughey, Isla Fisher and JENNIFER MEYER. According to an eyewitness, the couple's arrival at the ceremony was met with "stares" from the packed bar. The 26-year-old actress allegedly muttered "this is so terrifying" to the suit-clad Penn, who held her hand.
An insider close to Scarlett Johansson said that the actress is "head over heels" for the Oscar winning Penn. The 'Lost In Translation' star had previously distanced herself from rumours of a relationship, noting that she was only interested in the actor's relief effort in earthquake ravaged Haiti.