Off the top of my head..
YA contemporary romanceChelle Mitcheter - not exactly a series but really liked her two Bright Photography books, Bad Billy Brighton and Evelyn Vine Be Mine
Jamie McGuire - Beautiful Disaster series
SC Stephens - Thoughtless series
YA paranormal romanceJulie Kagawa - Iron Fey
Shelly Crane - Significance
Quin Loftis - Grey Wolves
Lacey Weatherford - Of Witches and Warlocks
CC Hunter - Shadow Falls *this one isn't outright romance but has some romance in it
Hope this helps!
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Thanks are appreciated