For a liquid highlighter I recommend the No7 Skin Illuminator (peach). This is a very new purchase of mine but I had to include it because it's divine. The only flaw I have with it is the packaging as it's a brush applicator which can get a bit messy and can waste some product but once you've got the technique right it's not that bad. The shade is really gorgeous and gives a peachy shimmer to the cheek bones. It's not sticky and sits really well on top of foundation and under powder.
Next for a cream highlight I love the Jemma Kidd Dewy Glow All Over Radiance Créme (Iced Gold). This product is sadly no more nor is Jemma Kidd which is so sad. I won't talk about it too much as you cannot buy it anymore but for those of you who do this is a reminder to put it into your spring makeup bag! It's a gorgeous milky gold shade which applies easily to the skin. It's lasted me well and is a bit battered - I keep this one for special occasions as I've now hit pan. Such a shame it isn't around anymore but a gorgeous product.
Finally for a powder highlight my favourite is one from Accessorize (Golden Caramel) I bought this ages ago and it's meant to be an eyeshadow but I find it looks beautiful as a highlight too. I'm sure these are very inexpensive and they're such lovely quality!
There you have my three top highlighters, please let me know of any good ones that you use as I'm on the market to try more! I've had my eye on the Topshop ones for a while (are they any good?) Thankyou for reading!