Originally published on?People.com.

The Powell pack is expanding once again!

Extreme Weight Loss?trainer?Chris, 35, and wife?Heidi Powell, 31, will welcome a fourth child to the family this fall, a rep confirms to PEOPLE exclusively.

?We feel so blessed to have three amazing kids between us, and now to have a fourth on the way? Unbelievable and amazing!? the proud parents tell PEOPLE.

Equally as excited is Chris and Heidi?s youngest son,?2-year-old?Cash, who is busy counting down the days until his sibling status officially changes. ?Cash can?t wait for his chance to be a big brother!? the couple say in a statement.

The new baby will also join?Marley, 6, and?Matix, 8, Heidi?s children from her previous marriage.

Between Chris and Heidi?s hit reality series ??Extreme Weight Loss?airs Tuesdays on ABC ? and another baby on the way, the family of five is juggling a full plate ? and inviting their fans to follow along.

In the new web series on ABC.com,?Meet the Powell Pack, viewers can catch a sneak peek into the brood?s busy life on the go.