In 2009, Chisholm made her stage debut in the West End musical Blood Brothers, for which she was nominated for an Laurence Olivier Award.

[35] She also co-wrote and recorded the backing vocals for "(Hey You) Free Up Your Mind", sung by Emma Bunton from the film soundtrack Pokémon: The First Movie.

[37] To promote the album, Chisholm embarked on a tour called From Liverpool to Leicester Square, travelling to Australia, the US, Canada, Japan, the UK, Germany, Italy, Spain, France, Netherlands and Denmark, between 27 September and 1 November.

[48] In late 2000, after the first solo work of members, the Spice Girls released their third and final album, Forever, sporting a new edgier R&B sound.

[39][80] In support of the album, she embarked at Beautiful Intentions Tour, starting on 16 April in O2 Academy Birmingham, in London, and travelling for twenty-five dates across Europe and Asia.

[87][91] Produced and co-written by Peter Vettese, it has been soundbed for the spring advertising campaign for German television show Nur die Liebe zählt [de].

[95] During an interview at Loose Women, Chisholm revealed that she wrote this song after watching a documentary about young adults and teenagers homeless, living in the streets in Seattle.

[102] They released a compilation album, the Greatest Hits in November, including the singles, the 1997 Pepsi's theme "Move Over" and two new songs, "Voodoo" and "Headlines (Friendship Never Ends)".

[112] On 29 June, Chisholm released her second DVD concert, Live at the Hard Rock Cafe, including two previously unreleased songs, "Blue Skies All the Way" and "Paris Burning".

[122] Chisholm was mentor assistant in the third series of The X Factor Australia and helped the Mel B team, formed by under 25 years-old girls, during the selection process.

[129] In her interview for "Ask Melanie C Episode 8" on her YouTube channel, Chisholm said that she "feels very sad as The Sea was a really great album and it wasn't as successful as it deserved to be".

[37] "I Know Him So Well", a version of the Elaine Paige and Barbara Dickson song from the 1984 musical Chess, was released as a single on 11 November, featuring vocals by British singer Emma Bunton.

[37][143] She also was part of The Justice Collective, a super-group of musicians, including Robbie Williams and Paul McCartney, who recorded the charity song "He Ain't Heavy, He's My Brother".

[148] On 12 January 2014, Chisholm celebrated her 40th birthday with a special show for the fans, entitled Sporty's Forty, singing her hits and featured Emma Bunton.

[149] On 31 March, the Slovakian singer Peter Aristone released "Cool as You", featured vocals of Chisholm, as lead single from 19 Days in Tetbury.

[156] On 14 May Chisholm and the judges released a cover version of "Let's Groove", originally by Earth, Wind & Fire, and performed the song in the final.

This marked Chisholm's first time performing as a solo artist in Latin America and her first visit in many years since her days with the Spice Girls.

"[165] In June, Chisholm also performed for the first time in Brazil, playing live shows in both Rio de Janeiro and São Paulo.

[193] On 26 October 2021, Chisholm performed "2 Become 1" as a duet with Chris Martin of Coldplay for the 8th Annual "We Can Survive" concert by Audacy at the Hollywood Bowl in Los Angeles.

[220][221] On 19 December, she appeared as a guest performing "Stop" on Bunton's Christmas Tour at the Theatre Royal, Drury Lane concert.

[243][244] On 25 December 2024, It's Christmas Live from the Royal Albert Hall aired on Sky Showcase, featuring Chisholm performing with Ricky Wilson.

[264] While promoting her Who I Am autobiography in September 2022, Chisholm revealed that she had been sexually assaulted in October 1997, during a massage in a hotel in Turkey, on the eve of the first Girl Power!

[271] In 2013, Chisholm joined Jack Dee, Dara Ó Briain, Greg James, Chelsee Healey and Philips Idowu in Through Hell and High Water, a Comic Relief challenge which involved British celebrities canoeing the most difficult rapids of the Zambezi River.

In 2014, Chisholm travelled to Ghana to support a charity campaign by Procter & Gamble that provides African children with clean drinking water.

[281] The term "Cool Britannia" became prominent in the media and represented the new political and social climate that was emerging with the advances made by New Labour and the new UK Prime Minister Tony Blair.

Although by no means responsible for the onset of "Cool Britannia", the arrival of the Spice Girls added to the new image and re-branding of Britain, and underlined the growing world popularity of British, rather than American, pop music.

[294][295][296] The Pussycat Dolls,[297] 2NE1,[298] Girls' Generation,[299] Little Mix,[300][301] Fifth Harmony,[302] Lady Gaga,[303] Jess Glynne,[304] Alexandra Burke,[304] Kim Petras,[305] Charli XCX,[306][307] Rita Ora,[308] Demi Lovato,[309] Carly Rae Jepsen,[310] Regine Velasquez,[311] MØ,[312] Billie Eilish and Adele[313][314] credit the Spice Girls as a major influence.

Chisolm's version of the single was a success in German-speaking countries because it was used as the title song of the German soap opera telenovela Wege zum Glück.

At the time of The Sea's release, the lead single "Rock Me" served as the official theme song for German TV channel ZDF's coverage of the 2011 FIFA Women's World Cup.

[315] Chisholm holds the current record of attendance for a free concert within a public event thanks to her show on a float, during the 2019 Global Pride Tour, in the streets of São Paulo in front of 3.7 million people.