The singer, 44, shared a selection of snaps from the bash with 295k followers on Instagram.
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Rachel pulled out all the stops for Amelie’s 12th birthday.
The youngster had all her close friends around to celebrate and they enjoyed a sleepover.
Rachel transformed her front room with an amazing balloon display and mini tee-pees for the girls to sleep in.
They all had their own personalised water bottles, mini lanterns and cupcakes to tuck into.
Rachel said: “Amelie ..How are you 12! Wishing you the Happiest of birthdays darling girl ❤️
“So kind, sensitive and strong and with the wildest imagination 💫
“We are so proud of you. You have the biggest heart and we love you with all of ours.
“Keep following your dreams and reaching for the stars ✨.”
Rachel shares Amelie and Minnie, eight, with ex Alex Bourne.
The pair tied the knot in 2009, but in July this year announced they had split.
It comes shortly after Rachel broke the silence on if an S Club 7 reunion will ever happen – and why it’s taking so long.
The mum-of-two shot to fame in 1999 alongside Tina Barrett, Paul Cattermole, Jon Lee, Bradley McIntosh, Jo O’Meara and Hannah Spearritt as part of the British pop group.
The band was active between the years of 1999 and 2003.
Then in 2014, they reunited to appear on BBC Children in Need’s telethon, and toured around the UK for their arena reunion Bring It All Back the following year.
Rachel is definitely keen to do it all again – but has also explained why it’s so difficult.
Speaking exclusively to The Sun about if she would take part in a reunion, Rachel said: “I would definitely.
“I always say the same thing that getting seven of us together, it’s different to any band really because there is those extra two make who make a difference logistically.
“If everyone was up for it. One million per cent.”
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