Overview

• Ashlee Simpson marked her son Bronx's 16th birthday with an emotional Instagram post featuring throwback and recent photos.
• Fans noted Bronx's resemblance to his father, Fall Out Boy bassist Pete Wentz, with many calling him his 'doppelganger.'
• Simpson described Bronx as her 'rock' and 'greatest blessing,' expressing gratitude for being his mother in her heartfelt caption.
• Pete Wentz also shared a birthday tribute to Bronx on social media, posting a selfie with his son and expressing his love.
• Bronx, Simpson's eldest child from her previous marriage to Wentz, is close with his younger siblings from both parents' current relationships.