How I Met Your Mother's Cobie Smulders proudly shows off her baby bump " and a dazzling new sparkler from her boyfriend Taran Killam. Asked if the ring heralded an engagement, the actress responded with a joyous smile and a resounding "Yes". Though details of the proposal remain under wraps, the Vancouver-born beauty would reveal that her US comedy actor beau popped the question during the holidays with a "very romantic" gesture. The mum-