Last week, the 90's pop heavyweights performed as a seven-piece for the first time since Paul Cattermole quit the group in 2002, however not everybody was totally impressed with the vocals showcased during their medley - including Jo herself.
Addressing the questionable performance in an interview with BBC 5 Live, she explained: “I can't say too much about that because I've listened to it back and it wasn't great.
“In my defence, I was terrified... It's the first time I've been back for years and years.”
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Jo O'Meara
However, Jo did go on to say that she was pleased the group had decided to perform their vocals live rather than lip-syncing, adding: “I'd rather get criticised for doing a rubbish live vocal than a fantastic mimed one.”
Following their live comeback, S Club 7 held a press conference on Monday, officially announcing that they would be hitting the road for an 11-date UK arena tour in May.
Tickets for the tour - which band member Bradley McIntosh has said will be a “nostalgic orgasm” - go on sale on Friday, while Tina Barrett has said the are “talks ongoing” about making a TV documentary about the group’s reformation, akin to ‘The Big Reunion’.
See what you thought of the band's vocals by watching their comeback performance below:
S Club 7: Where Are They Now?
(01 of14)
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As soon as the band made it into the charts, Rachel Stevens became a permanent feature on FHM's annual Sexiest Women lists... (credit:PA)
(02 of14)
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... And in 2014, she's still in them.Rachel was recently named FHM's Sexiest Woman Of All Time. She's still in showbiz and in 2013, she appeared as a guest mentor on the New Zealand version of 'The X Factor'. Rachel starred in the 2009 series of 'Strictly Come Dancing' and has two children. (credit:Getty Images)
(03 of14)
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Hannah Spearritt had already appeared on 'Blue Peter' and 'The National Lottery Show' when she auditioned for S Club 7 after seeing a magazine advert in 1998. (credit:PA)
(04 of14)
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Now, she's more well-known as an actress and has starred in TV dramas 'Primeval' and 'Marple'. (credit:ExcaliburMcElhinney/WENN)
(05 of14)
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Paul Cattermole was the first singer to leave S Club 7 in 2002 after deciding to pursue a rock music career instead. (credit:PA)
(06 of14)
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After leaving the band, Paul split from Hannah, who he had dated for six years. In 2008, he reunited with Jo O'Meara and Bradley McIntosh. The trio performed a number of small gigs before disbanding again. (credit:PA)
(07 of14)
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Bradley McIntosh was just 18 when he was busted for drug use along with the other male members of S Club 7 in 2001. (credit:PA)
(08 of14)
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After failing to achieve chart success with band Upper Street, Bradley decided to go it alone and currently works as a singer and producer. (credit:Getty Images)
(09 of14)
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Dancer Tina Barrett was originally supposed to be in Mis-Teeq, however she chose to join S Club 7 after making it through the grueling audition process. (credit:PA)
(10 of14)
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Tina is still trying to carve a successful solo career and her next single 'Woman' is due for release later this year. (credit:Getty Images)
(11 of14)
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Jo O'Meara started out in a hip-hop group before becoming the lead vocalist in S Club. (credit:PA)
(12 of14)
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After the band's split, it was thought Jo would pursue a solo career, however, back problems meant she was unable to perform. Jo then appeared on 'Celebrity Big Brother' in 2007, where she became embroiled in a racism row. She now performs with band The Popes. (credit:PA)
(13 of14)
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Jon Lee was one of the only S Club 7 members who was new to showbiz when he joined the band. (credit:PA)
(14 of14)
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Nowadays Jon spends a lot more time in the gym. When he's not pumping iron, Jon appears on the West End stage and has starred in productions including 'Les Miserables' and 'Jersey Boys'. (credit:Instagram)