The Unflappable Miss Fairchild — Regina Scott

A Wild Gentleman
From outrageous wagers to somersaults in the Park, Chas Prestwick delighted in shocking the ton. After all, as the younger brother of an earl, he had nothing to lose. Only Miss Anne Fairchild, whom fate seemed bent on thrusting in his path, was unruffled by his escapades--even when a chance encounter made her his passenger in a wild carriage race to Kew Gardens. But Chas, entranced by her beauty, was far from complaining! Except that this angel, whose good sense rescued him from scrape after scrape, might be on the hunt for a titled bridegroom--which made him no catch at all...
A Level-Headed Lady
From pompous to vain, the most unsuitable suitors courted Anne Fairchild. Tolerant of all foibles, unschooled in flirtation, she was the despair of her family. Worst of all, only Chas Prestwick's dazzling smile could bring a blush to her demure cheek--and Anne's match-making aunts soon made clear their preference for a more lordly and less dashing husband.
But beneath Anne's polite exterior, her heart beat only for the handsome rakehell who made her long to trade in a life of propriety--for one that promised to a love filled with unpredictable delight...