Ellie revealed the secret to her mane on Instagram on Saturday (19 July) and, honestly, it's a smidge gross.
Accompanying a snap of her golden locks, Ellie said: "Best hair product is post show sweat."
Yup. Post-show SWEAT.
Ellie, 27, likes to get her perspiration on while she's performing then enjoy the effects a bit of sweat has on her hair afterwards.
Clearly in a sharing mood, Ellie also posted a video of her getting worked up for a performance. Scroll down to watch it.
TBH, we're kind of peeved that we don't look this good after a work-out. Ellie gets a lovely glow, we just look like a beetroot… Not fair!
The star, who is dating McBusted hottie Dougie Poynter, then jetted back to London as part of her crazy busy schedule on Sunday.
She told her Twitter followers: "Back to London for one day only... bout to get on this RyanAir flight with a very high quantity of stag do's."
We bet they loved Ellie's sweaty hair treatment as much as we do!
Watch Ellie work up a sweat here…
Reveal is now on Google Plus! Join us here for the latest pictures, fashion and celebrity news!