The singer, who recently reunited with Mutya Buena and Siobhan Donaghy, tweeted that she had discovered songs the group recorded together when they were 12 years old.
She said: "Found a bag full of old demo tapes from myself, shiv & mut singing when we were 12 lol There's at least 30 tracks! Sounds so funny & Cute!
"Hmm what 2 do with them;-) As red face as it makes me I realllly wanna share it with you guys lol Let me talk to the girls & get back to you."
The first Sugababes lineup released one album together in 2000 titled One Touch when they were 15 years old, but were initially signed to London records in 1998.
The LP spawned the singles 'Overload', 'New Year' and 'Run For Cover' before Donaghy left the band in 2001.
Watch the 'New Year' music video below: