Credit: Courtesy of Alli Simms

It seems as if everyone from Britney Spears' past is having babies these days.

Weeks before the singer's ex-husband Kevin Federline became a father for the fifth time, Spears' cousin and former assistant Alli Sims welcomed a beautiful baby of her very own with husband Luke Forstmann. 

Sims gave birth to daughter Allegra Theodora on July 14, Us Weekly can exclusively confirm. The Louisiana-based wedding planner, who once aspired to be a pop star like her famous cousin, tied the knot with Forstmann, a former IMG account executive, on January 22, 2011. Sims runs her own event and PR firm, Alli Sims Events and Designs. 

"I am so happy and completely in love with her," the new mom told Us.