Kate Middleton Pregnancy: Pippa Middleton Visits Royal Sister at London Hospital

Duchess is being treated for hyperemesis gravidarum, gets visits from Prince William, brother James and mother Carole

Pip, pip hooray! The cool [future] aunt has arrived.

Pippa Middleton paid her pregnant sister Kate Middleton a visit Wednesday at London's King Edward VII Hospital.

Looking cute and casual in a belted trench, the 29-year-old party planner and author surely lifted the spirits of the Duchess of Cambridge, who's being treated for a severe form of morning sickness.

Pippa, of course, wasn't Kate's only visitor in the sick bay. Prince William has dutifully been by his wife's side, and Kate's brother, James, and mom, Carole, have also stopped in to check on the duchess.

Your move, Uncle Harry!