When asked by Joan Rivers what she thought of one of Madge's costumes on her current MDNA world tour, Kyles simply replied 'no, no, no'.
But it looks like Madge isn't holding any grudges as Kylie was spotted backstage and in the front row of her gig in Hyde Park last night.
Well, we say front row, 5ft nothing Kyles was actually in the area reserved for the kids of special guests so she could get a good view of the show.
The diminutive Pop Princess - dressed for the British weather in designer wellies, rain mac and wide brimmed hat - posted a snap on Twitter of her in the specially reserved zone with the message: "Yep...in the kidz zone...easier to see LOL!!!"
Other A-listers spotted at the show included Stella McCartney, George Michael, Kate Moss and Naomi Campbell.
But not everyone was quite as smiley as Kylie after the gig - with many fans leaving the show early after branding it 'the worst ever' Madonna show.
According to The Evening Standard, hundreds of fans walked out of the concert before the finale after complaining about a lack of hits in the show.
> IN PICS: MADONNA LIVE AT LONDON'S HYDE PARK