But many disgruntled fans took to Twitter to express their annoyance at the poor sound quality at the gig in the 82,300-seat capacity Croke Park stadium.
Brown said in a video on Instagram after the show that she hoped the sound "will be much much better" next time. "We will see you in Cardiff and hopefully the vocals and the sound will be much, much better".
On Friday night, Britain's most famous (but not necessarily favourite) girl band played the first date of their Spice World comeback tour in Dublin - "where it all began", as Emma Bunton noted, more than 20 years ago.
After their Dublin show, the Spice Girls will perform concerts in Cardiff, Manchester, Coventry, Sunderland, Edinburgh, Bristol and London - finishing at Wembley Stadium on June 15.
She said: "In '98, we started our world tour in Dublin, so we truly are home". But Mel B hinted on Celebrity Juice this week that Posh Spice will be making a surprise appearance at some point.
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That comes as Qatar has grown closer to Iran after facing a almost two-year boycott by four Arab nations also allied with the U.S. It comes after the Houthis last week targeted a Saudi oil pipeline in a coordinated drone attack.
Brown was the lone band member to weigh in, as the rest of the singers took to social media simply to thank fans and express their own excitement.
Fans in attendance complained about not being able to hear the women sing and called the sound issues "awful".
Mel reportedly shocked fans at the gig by swearing during the action-packed show before twerking against a backing dancer wearing her iconic leopard print catsuit.
"Emma, you'll always be my little sister, (much to your annoyance) who I want to protect. Got [sic] gonna lie I was prepared to be disappointed but good god they were UNREAL".
The Spice Girls last performed with all five original members at the closing ceremony of the London Olympics in 2012.