The actress rose to fame aged just six years old after landing the role of youngest child Karen Brockman in the BBC1 sitcom.
Next month, Ramona and her co-stars will return for one final series of the show - and she couldn't look more grown up!
Romana, who turns 13 next month, has swapped her blonde curly hair for a sleeker straight brunette 'do, complete with eyelash skimming fringe.
We almost had to do a double take when we saw the picture!
In the fifth and final series, Romana's character Karen decides she no longer wants to be blonde when she starts secondary school - hence the colour change.
Older on-screen brother Jake, played by Tyger Drew-Honey, is sporting a new tattoo (of sorts...) and is learning to drive.
Meanwhile, middle child Ben, played by Daniel Roche, has landed the lead in his school play - a musical version of Spartacus - despite being tone deaf...
Outnumbered, 9pm, BBC1, Wednesday 29 January