So we asked her to spill her beauty secrets and show us how she created some of summer's sexiest looks on co-star Caggie Dunlop.
'I've always loved make-up and used to love giving friends makeovers at boarding school,' Millie tells us.
'For me, it was such a fun way to keep ourselves entertained when we had nothing to do.
'I was quite experimental with the looks and would always try to give everyone a different style.
'And when there was a party, the girls in the older years would ask me to do their make-up for them, so I think it just stems from that.'
Millie believes it's essential to take care of your skin.
'There's nothing worse than having spotty skin, or a blemish come up, especially if you're filming as often as I do,' she says.
'The last thing you want is to worry about your skin.
'In the past, not having the best skin has really affected my confidence, but now I use the Manuka Doctor ApiClear range to keep my skin clear. I really like the serum and foaming face wash.'
VIDEOS: Watch Millie Mackintosh teaching Caggie Dunlop how to create 5 hot new looks for summer...
Luminude:
Berry lip:
Spring pastel:
Wet smoky:
Glitterati:
- Manuka Doctor ApiClear is available from Holland & Barrett

Read the full interview with Millie Mackintosh and Caggie Dunlop in the Now Celeb Hair & Beauty specal dated May 2012 - out now!
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