Brad Paisley's actress wife has laughed off reports suggesting the singer has been having an affair with fellow country star Carrie Underwood. The Celebrity hitmaker, who celebrated his 10th wedding anniversary with Nashville star Kimberly Williams-Paisley earlier this year (13), became the subject of a National Enquirer article last week (ends22Nov13) amid false allegations he has been hooking up with Underwood behind their spouses' backs. However, Williams-Paisley is confident there is absolutely no truth to the cheating claims. Laughing at the suggestion of infidelity, the actress tells UsMagazine.com, "Are you serious? Wow! I hope it helps our careers! That's all I can say." Paisley and Underwood have become close friends over the years and reunited earlier this month (Nov13) to co-host the 2013 Country Music Association Awards for the sixth consecutive time. Underwood is married to ice hockey star Mike Fisher.