She was a featured judge on MTV's Top Pop Group, a contestant on season 8 of Strictly Come Dancing in the United Kingdom, and starred in the Oxygen reality television series Fix My Choir. Making her acting debut on Broadway in Aida (2003), she has since starred in the sitcom series Half & Half (2006) and the musical productions The Color Purple (2007), Chicago (2009–10), What My Husband Doesn't Know (2011) and Fela! (2013).

Williams has found success as a television, Broadway and West End theatre actress, gaining a nomination for ' Best Lead Female – Equity' in 2008 at the 18th Annual NAACP Theatre Awards. Her fourth studio album, Journey to Freedom (2014), received positive reviews and became her highest-charting album in the US it includes the singles ' If We Had Your Eyes', and ' Say Yes' which topped the US Hot Gospel Songs chart for seven weeks, and won the Stellar Award for Music Video of the Year. After Destiny's Child's disbandment in 2006, Williams released her first pop album, Unexpected (2008), which spawned the singles ' We Break the Dawn' and the US Dance number-one ' The Greatest'. Following this, she released her second solo album Do You Know (2004).

That same year, Billboard named Williams the fifth best-charting gospel artist of the year and she received a MOBO Award for 'Best Gospel Act'.

During the group's two-year hiatus, 2001–2003, Williams released her debut solo album Heart to Yours (2002) which topped the US gospel album chart and became the best-selling gospel release of the year.

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