Allison Williams is to marry in a secret ceremony today (19.09.15).

The 'Girls' actress is set to tie the knot with CollegeHumor co-founder Ricky Van Even in front of guests including Lena Dunham, Tom Hanks and Bruce Springsteen.

A source told the New York Post newspaper: ''The wedding is being kept so secret that guests are being asked to fly to Denver, where they will be picked up and taken to the location, which is thought to be somewhere in Wyoming.

''The accommodations for all guests are being paid for and then many of the guests are flying to LA together for Sunday's Emmys.''

Allison's fellow 'Girls' co-stars will be present including Lena, Zosia Mamet and Jemima Kirke. They will be joined by the star's father, news presenter Brian Williams, and Tom and his wife Rita Wilson, who plays Allison's mother on the hit HBO comedy.

Other guests set to attend the star-studded nuptials include Seth Meyers, Andy Cohen and Diane von Furstenberg.

The stunning brunette previously admitted she had delayed her wedding to Ricky - to whom she has been engaged since February 2014 - due to the controversy surrounding her father Brian. The NBC news presenter was suspended earlier this year for embellishing details of his experiences while reporting on the front lines of the Iraq War and Hurricane Katrina.

In February, Allison, 27, said: ''This has been a really hard time. Obviously [it's] toughest on my dad, who is sort of bearing the full burden of the responsibility for it ... Current events started happening so that derailed [wedding plans] a little bit.''