Reese Witherspoon argues with Jim Toth about coffee.

Reese Witherspoon

Reese Witherspoon

The 'Hot Pursuit' star says she is addicted to caffeine and her talent agent husband is concerned about her obsession with the beverage.

She said: "My husband gets mad at me. He's like, 'You drink too much coffee.' I try to only have two cups in the morning and that's it, but it gets to be 4pm and I'm so tired."

The 39-year-old star also admits she finds it more exhausting being at home with her children, Ava, 15, Deacon, 11, and two-year-old Tennessee, than on a film set.

The Oscar winner told PEOPLE magazine: "I drink more [coffee] when I'm at home with all my children. It's 4pm and I want to lie down and take a nap. It's like, 'I HAVE TO DRINK COFFEE.' "

Reese's co-star Sofia Vergara was also shocked by how much coffee she consumes.

The 42-year-old actress said: "She eats a lot! She's vey delicate and petite, but she eats a lot. And I've never seen someone drink more coffee [than her]. I mean, I'm the Colombian one."

The duo are close friends, but the 'Modern Family' star is very jealous of the blonde beauty's legs.

She said: "I would wear all the miniskirts that she wears [if I could switch bodies with her for a day.] She has great legs, and she can wear anything she wants. Now I'm like, 'Eh.' I don't feel that comfortable wearing tiny miniskirts. I used to when I was younger."