Kristin Cavallari says her children already have a ''really cute'' bond.

The former 'The Hills' star, who has 23-month-old son Camden and two-month-old son Jaxon with husband Jay Cutler, is glad they get along really well.

She said: ''Cam is really cute with Jax. He gives him kisses and holds his hand.''

The shoe designer's eldest son recently started talking and she loves watching her boys change.

She said: ''We just potty-trained Camden which we're really excited about! He's also starting to talk, which is hilarious and a ton of fun. Jax is getting close to holding his head up on his own.''

The 27-year-old star has lost 20 pounds since giving birth to Jaxon in May.

She told E! News: ''I started working out when Jax was three weeks old. I've been working out four to five times a week for 30 to 45 minutes at home, doing tons of leg work like squats, lunges and lifting weights.''

She added: ''I'm still a couple of pounds away from my pre-pregnancy weight, but it took a solid three months with Camden and I think it will be the same this time. ''

The petite star insists she hasn't embarked on a special diet to help her slim down.

She said: ''No, my diet is always the same. I don't eat any toxic chemicals and I try to eat organic as often as possible.''