She is the only person not taking part in the two-week long Hear'Say and Liberty X reunion tour, claiming she is 'too busy.'
And Myleene Klass, 48, showed what she has going on in her diary on Monday while her former bandmates were promoting their tour on This Morning.
The other members of Hear'Say addressed Myleene's absence from the 25-year reunion to hosts Cat Deeley and Ben Shephard, calling it 'a shame.'
Myleene spent the morning lying across the concrete floor of the Royal Albert Hall wearing a blue frilly tulle dress.
The one-shoulder gown had an ombre coloured effect and trailed behind her as she posed for photos.
Myleene will be hosting Classic FM Live on Monday evening at the iconic London venue alongside fellow presenter Dan Walker, 49.
The duo will be joined by special guest Aled Jones MBE – for an evening of music, performed by the Philharmonia Orchestra and conducted by Stephen Bell.
Myleene Klass posed on the floor in a giant ballgown as her ex-bandmates Hear'Say broke their silence over her claims she's 'too busy' to take part in the two-week reunion tour
Myleene spent the morning lying across the concrete floor of the Royal Albert Hall wearing a blue frilly tulle dress
The event will feature dramatic lights and fireworks across a jam-packed programme of space-inspired classical hits, from Holst’s The Planets’ Suite to Strauss’ Also Sprach Zarathustra.
Elsewhere, four of Hear'Say's original members: Danny Foster, Kym Marsh, Suzanne Shaw and Noel Sullivan, joined Liberty X on television this morning.
Last week, Myleene broke her silence on the Hear'Say reunion, insisting she had no time in her busy schedule to join the band – which they branded 'a shame'.
Kym said: 'We feel so lucky to do this again... it's a shame Myleene can't come with us but it just isn't the time for her. She's busy. But we had to take the opportunity because there's nine of us... It's a shame but we're so excited.'
Myleene told Loose Women viewers that her bandmates 'were really sweet, and they did include me in the discussions...
She said: 'But it's not something I can commit to at the moment. I just really can't. I know that they're still figuring out a lot of the moving parts of it. But for me, I'm just super busy. I'm committed to you guys.'
Fans took to social media to say Myleene is acting like the two-week tour is 'beneath her' while others insisted she needs to remember her roots.
When asked by Cat if there was 'ever any doubt in her mind,' Kym said: 'Not in terms of doing it, it was more a case of can we make it happen with our "day jobs",' while Ben Shephard pointed out the logistics of their family.
Noel revealed they attempted the reunion on their 20th anniversary which 'they couldn't make work' so was happy to be back for the 25th anniversary.
Myleene will be hosting Classic FM Live on Monday evening at the iconic London venue alongside fellow presenter Dan Walker, 49
The event will feature dramatic lights and fireworks across a jam-packed programme of space-inspired classical hits, from Holst’s The Planets’ Suite to Strauss’ Also Sprach Zarathustra
The other members of Hear'Say, alongside Liberty X addressed Myleene's absence from the 25-year reunion to hosts Cat Deeley and Ben Shephard, calling it 'a shame'
Hear'Say were created on Popstars
Previously the likes of Atomic Kitten, Five (5ive), Blue, B*Witched and The Pussycat Dolls have reunited but haven't experienced the same buzz as Hear'Say and Liberty X.
Elsewhere on Loose Women, Myleene added that she looks back on her time in the band fondly, and is still on good terms with her old bandmates.
She insisted: 'I love the guys dearly. It was an incredibly important time in my life. It taught me so much. You know, epic songs like that and moments like that.'
The star did say she hasn't completely ruled out revisiting Hear'Say and will be front row when they do get back onstage, though she quipped she has no idea if she remembers all the lyrics.
She said: 'I would say never say never about anything because, as I said earlier to you guys, you know, I don't really agree on revisiting the past.'
Yet Daily Mail's Katie Hind reported that Kym and Myleene's old rift was still rumbling on, more than two decades later.
From the moment Kym and Myleene were chosen to be in Britain’s first TV talent show band, the two women were at war.
Both were beautiful and fiercely ambitious, and it was immediately clear to those working with the pair that Hear’Say, the group forged in 2001 out of ITV’s Popstars, was not big enough for the two of them.
One member of the group’s entourage would regale me with tales of what a ‘nightmare’ his job was as Myleene and Kym constantly bickered. Read more here.
Daily Mail have contacted Myleene's representatives for more information.
Hear'Say were one of the earliest major UK TV-created pop groups, formed through ITV's Popstars in 2000-01.
The band were selected from thousands of applicants, with the formation of the band being documented on television.
Their debut single, Pure and Simple, was a phenomenon and went to No1 in the UK selling 549,823 copies in its first week, setting a record at the time for a debut single.