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Katharine McPhee Sweetly Kisses Son Rennie, 3, as She Celebrates Husband David Foster's 75th Birthday: 'My Whole World'

David Foster Says 3-Year-Old Son Rennie Is Taking a Break from Drumming, Explains Why He Won't Push Him to Continue

David Foster Reveals Why Son Rennie, 3, Is 'Taking a Break' from Drumming: 'You Can't Push Them' (Exclusive)

Katharine McPhee Celebrates Mother's Day with Sweet Throwback Photo of Son Rennie: 'Best Day of My Life'

David Foster Jokes It's 'Upsetting' When Son Rennie, 3, 'Pounds' the Piano: 'He's a Kid!'

Katharine McPhee, 39, and David Foster's, 74, son Rennie, three, makes drumming debut at their show: 'Had a VERY special guest join us on stage'

Katharine McPhee & David Foster's Son Rennie, 3, Makes Stage Debut, Plays the Drums at Their D.C. Concert

Katharine McPhee Celebrates Son Rennie's Third Birthday with Disney World Vacation!

Katharine McPhee Shows Off 2-Year-Old Son Rennie's Incredible Drumming Skills!

Katharine McPhee sweetly kisses her son Rennie, two, while on tropical getaway

Katharine McPhee, 39, reveals she and husband David Foster, 74, disagree over disciplining son Rennie, two: 'His era of parenting is different than mine'

Katharine McPhee & David Foster Talk Differences in Discipline Styles for Two-Year-Old Son Rennie