TV's biggest reality family is getting bigger.
Jim Bob and Michelle Duggar of TLC's "18 Kids and Counting are expecting their 19th child .
"We are so thrilled, Michelle, 42,
. "We just couldn't believe it is happening.
Michelle is expected to give birth five months after daughter-in-law Anna gives birth to the Duggars' first grandchild.
Anna, 21, is expecting a girl next month with the Duggars' oldest son, Joshua, 21.