But Norwich-born Dennis, who also had a stream of hits in the 1990s as a solo pop star, has not let success go to her head with her quiet determination to succeed and strong work ethic.
Wigan made up for it on 53 minutes when their star man Tomkins stole in for a superb solo try, resisting the challenges of three men and snaking out an arm to stretch his side three scores clear again.
Williams was arguably Britain's biggest pop star in the late 1990s and first part of the 2000s, selling 60 million solo albums and winning a record 17 Brit Awards.