Rosamund Pike has joined the May mom's club after giving birth to a son.
 
The star has given her baby boy the unusual name Solo, according to Britain's Daily Mail on Sunday.
 
The tot is Pike's first child with 49-year-old businessman Robie Uniacke, her partner since December, 2009.
 
The actress joins fellow new mums Jessica Simpson, actresses Mira Sorvino and Marley Shelton, as well as British star Stacey Solomon, who have all welcomed new arrivals this month.