Simpson, who gave birth to the couple's first daughter, Maxwell Drew, on May 1, is also organising the newborn's baptism and is said to have hired celebrity party planner Mindy Weiss for both the events, reported Contactmusic.
The "Blonde Ambition" star and former NFL player Johnson had earlier planned to tie the knot last November but had to postpone the wedding after discovering that they were expecting Maxwell.
The actress-designer, 31, is "determined" and "excited" to lose her baby weight after signing a USD 4 million endorsement deal with Weight Watchers.
"As soon as Jessica heals from the C-section, she is extremely determined to get back in the gym and work out. She wants to show the world and is excited to do it," said a source.
