Reese and film agent Jim tied the knot on 26 March in a ceremony at Witherspoon's six-acre California ranch.
The 35-year-old Legally Blonde star reportedly wore a Monique Lhullier dress as the couple exchanged vows on 26 March.
Among the 120 guests attending were A-Listers Renee Zellweger, Spiderman star Tobey Maguire, Isla Fisher, Matthew McConaughey and Alyssa Milano.
Reese was previously married to the father of her two children, Ava and Deacon, Ryan Phillipe, for eight years.