Over lined lips are definitely a trend at the moment due to the amount of celebrities getting lip fillers and the hefty price of doing so. Lip liners therefore are the perfect alternative to a cosmetic procedure, and can have a real impact, without looking obviously drawn on.
This is me with overly lined lips, it's not massively obvious but it definitely makes a difference. This is the combo I'm wearing quite a lot at the moment, and both items are pretty well known. The lip liner is Spice by MAC and the lipstick is Brave, also by MAC.