X17 XCLUSIVE - Nicole Looks Tired And Bored In LA While Joel Parties In Vegas!

On Saturday afternoon, hot mama Nicole Richie went to a park in Bev Hills with little Harlow, and even though the adorable celebritot looked thrilled to check out the ducks, Nicole appeared frazzled and exhausted!

Babydaddy Joel Madden tweeted that he was having "a blast" spinning at Prive in Las Vegas and Push in Robinsonville, Mississippi over the weekend, but it def didn't look like Nicole was enjoying her time here without him!

Of course, she did JUST give birth to little Sparrow so we gotta cut her a break, but it looks like her kiddos are totally wearing her out! Now that Joel's back in town, we're guessing he's going to be on daddy duty while Nicole catches up on her beauty rest!