Glowing 4-months-pregnant Kate gets behind the wheel in Birmingham

— -- Prince William and Princess Kate, who is four months pregnant, spent the day away in Birmingham, England, as they toured the West Midlands, delighting locals.

They both got behind the wheel for some off-road driving at a Land Rover test course. William steered, with Kate riding shotgun, over the rocky course before she took the wheel.

Kate, who is due in April 2018, showed no signs of hyperemesis gravidarum, the severe morning sickness that sidelined her in September, as she navigated the terrain, which has a warning for pregnant women.

William and Kate were presented with a selection of musical whistles for Prince George, 4, and Princess Charlotte, 2, at Acme Whistles, where the first police whistle was created. William, who has spoken about his "noisy son," thanked his hosts for the whistles but joked, "Don't show that to George. We'll never get any peace."

William and Kate, who have a cocker spaniel, Lupo, were also shown dog whistles. Kate asked about the special whistles whose pitch can't be heard by humans, saying, "There are different pitches for different dogs, aren't there?"

The two ended their day meeting up with children at Aston Villa F.C.'s stadium, William's favorite soccer team. They joined young people involved in the Coach Core training program, a mentorship apprenticeship opportunity sponsored by William, Kate and Harry's charitable organization, the Royal Foundation.