Much like Benjamin Button, she seems to age backwards and it's hard to believe we're celebrating her 50th birthday. Want to know her secret? Here's what we've learnt over the years...
She's been using the same lip liner for over 15 years as she says you can 'mix anything with it.' Estée Lauder Automatic Lip Pencil Duo in Fig, you lucky thing.
She's also a huge fan of blogger-favourite "Better than Sex" Mascara by Too Faced.
Debenhams, we're coming for ya.
Clever hacks for using lip liner to perfect your pout and make your lippy last longer
The 49-year-old also spoke to Well and Good about her beauty and wellness regime - and we were basically clinging onto every last word.
Rather than plumping for expensive serums or pricey anti-ageing treatments, Jennifer prefers to keep things pared back, simply by washing her face with soap and water and applying a day cream with added SPF. So far, so basic.
Then she revealed the real anti-ageing hero behind her youthful glow: a collagen peptide.
'There’s a collagen peptide that I’ve been loving,' she said. 'I’ve been seeing a difference.
Collagen is absolutely essential for our skin, here's how to add it to your beauty regime
'My nails are stronger and there’s a healthier...how do you explain it? A glow. It’s sort of that working from the inside-out thing.'
Jen swears by the brand Vital Proteins. The best news? You can emulate the star for just £11. We knew we loved her for a reason, happy birthday Jen!