Jessica Simpson on how husband Eric Johnson keeps her 'hot' (Exclusive)

After being married for four years and welcoming two children together, Jessica Simpson credits her husband, Eric Johnson, for keeping her youthful and healthy.

ET caught up with the actress and lifestyle mogul at BeautyConLA at the Los Angeles Convention Center on Saturday -- where she was joined by her 6-year-old daughter, Maxwell  -- and she opened up about her happy, adoring relationship with her handsome hubby.

"He keeps me hot, I have to say," Simpson shared.

The celeb recently celebrated her 38th birthday on July 10, and she celebrated the special occasion with a super sultry, fiery red -- which she shared a photo of to Instagram on her special day.

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Sultry 38

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"I wanted to have fun, to feel sexy and it's like, OK, 38, what are we going to do to celebrate 38? Let's have red hair," Simpson explained.

However, more than just the hair, she said her desire to stay healthy and youthful is motivated by seeing how energetic and excited her husband is, especially around their adorable kids.

"He's always throwing around the kids, and he's just an amazing father, it makes me want to stay young," Simpson shared. "Like how can you be so active? I mean watching the kids running makes me exhausted."

While the pair are absolutely devoted to their two children -- Maxwell and their 5-year-old son, Ace -- Simpson reiterated that they are content with the size of their family as it is.

"Were good, we are chilling," Simpson shared. "I mean we're very happy and we know how to make babies very well but, we got the little one here."

Maxwell tagged along with her mom, and Simpson called the event a "definite bring your daughter to work day."

"It is all about beauty and my daughter is just as obsessed with hair and make up and entertainment, as I am," she shared.

The proud mom also said that her little girl gave her some much-appreciated input when designing some new products, explaining, "She has helped me along the way. It's good to have an opinion from a 6-year-old, we all need a little youth."

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Jessica Simpson and Eric Johnson together
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Jessica Simpson and Eric Johnson together
WACO, TX - MAY 06: (Exclusive Coverage) Jessica Simpson and Eric Johnson attend a spring style event benefitting The Boys and Girls Clubs of Waco, TX at at Dillard's on May 6, 2017 in Waco, Texas. (Photo by Kevin Mazur/Getty Images for Jessica Simpson Collection)
NEW YORK, NY - APRIL 21: Jessica Simpson,Eric Johnson are seen in the East Village on April 21, 2017 in New York City. (Photo by Alo Ceballos/GC Images)
NEW YORK, NY - APRIL 20: Jessica Simpson and Eric Johnson seen on the streets of Manhattan on April 20, 2017 in New York City. (Photo by James Devaney/GC Images)
NEW YORK, NY - APRIL 19: Jessica Simpson and Eric Johnson are seen going to dinner in the East Village on April 19, 2017 in New York City. (Photo by Gotham/GC Images)
LOS ANGELES, CA - JULY 14: Singer Jessica Simpson and Eric Johnson are seen on July 14, 2016 in Los Angeles, California. (Photo by gotpap/Star Max/GC Images)
LOS ANGELES, CA - JULY 14: Eric Johnson and Jessica Simpson attend the 'Gleason' Los Angeles Premiere at Regal Cinemas L.A. Live on July 14, 2016 in Los Angeles, California. (Photo by Todd Williamson/Getty Images for Amazon Studios)
BEVERLY HILLS, CA - FEBRUARY 27: Eric Johnson and Jessica Simpson attend the 'Tom Everhart 'Raw' Exhibition of His Schulz-influenced Paintings For The First Time In Black And White At Mouche Gallery on February 27, 2016 in Beverly Hills, California. (Photo by Amy Graves/WireImage)
LOS ANGELES, CA - JANUARY 13: Jessica Simpson and Eric Johnson are seen at LAX on January 13, 2016 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
NEW YORK, NY - JANUARY 12: Jessica Simpson (L) and Eric Johnson attend the 2016 YMA Fashion Scholarship Fund Geoffrey Beene National Scholarship Awards Dinner at Marriott Marquis Times Square on January 12, 2016 in New York City. (Photo by Kevin Mazur/WireImage)
NEW YORK, NY - NOVEMBER 07: Jessica Simpson and husband Eric Johnson were seen out for a Tom Everhart Art Gallery event then dinner at Vic's Restaurant in SoHo on November 7, 2015 New York City. (Photo by Robert Kamau/GC Images)
LOS ANGELES, CA - SEPTEMBER 11: Eric Johnson and Jessica Simpson are seen at LAX on September 11, 2015 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
NEW YORK, NY - SEPTEMBER 09: Eric Johnson and Jessica Simpson attend Jessica Simpson Collection Presentation Spring 2016 New York Fashion Week on September 9, 2015 in New York City. (Photo by Desiree Navarro/WireImage)
NEW YORK - SEPTEMBER 08: Jessica Simpson and Eric Johnson seen entering there East Village hotel on September 08, 2015 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK, NY - SEPTEMBER 08: Jessica Simpson and Eric Johnson are seen walking in Soho on September 8, 2015 in New York City. (Photo by Raymond Hall/GC Images)
VENICE, CA - APRIL 23: Singer Jessica Simpson and her husband Eric Johnson attend a special preview of 'The Gleason Project' at ZEFR Warehouse on April 23, 2015 in Venice, California. (Photo by Amanda Edwards/Getty Images)
NEW YORK, NY - MARCH 13: Jessica Simpson and Eric Johnson are seen in the Lower East Side on March 13, 2015 in New York City. (Photo by Alo Ceballos/GC Images)
LOS ANGELES, CA - NOVEMBER 17: Eric Johnson and Jessica Simpson arrive at the Los Angele Premiere 'The Hunger Games: Mockingjay Part 1' at Nokia Theatre L.A. Live on November 17, 2014 in Los Angeles, California. (Photo by Jon Kopaloff/FilmMagic)
NEW YORK, NY - OCTOBER 01: Jessica Simpson and Eric Johnson are seen in Soho on October 1, 2014 in New York City. (Photo by Alo Ceballos/GC Images)
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