Kim Kardashian's daughter North, 8, & niece Penelope, 9, help Jessica Simpson's kid Maxwell open gifts at 10th birthday

Jessica Simpson, 42, shares a photo of her two eldest children

See North & Penelope Celebrate Jessica Simpson's Daughter's B-Day

Inside Jessica Simpson's lavish birthday party for daughter

Jessica Simpson & Kim Kardashian's Daughters Bond On Birthday Trip

North West and Penelope Disick Celebrate Jessica Simpson's

Jessica Simpson's Daughter Maxwell With North West & Penelope

Jessica Simpson, 42, shares a photo of her two eldest children

Penelope Disick : Latest News - Life & Style

Kim and Khloe Kardashian Cheer on North's Basketball Game

Jessica Simpson's Daughter Maxwell Celebrates 10th Birthday with