Jennifer Garner‘s kids are growing up, but her youngest still enjoys a good cuddle.

“I sang to my son last night. I sing putting them to bed every night,” theCampingstar, 46, says in this week’s issue of PEOPLE of sonSamuel Garner, 6½, plus daughters Seraphina Rose Elizabeth, 9½, andViolet Anne, 13 next month.

And her tune of choice would make Kermit the Frog proud.

“I have sung‘Rainbow Connection’probably 16 million times but I definitely mix it up,” she reveals. “That one is definitely a staple — if all else fails, ‘Rainbow Connection.’ ”

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While the formerAliasactress is certainly busy in her flourishing career, she always makes time for her kids — in fact,her routine with Samuel isa “part of every night.”

“My son is the last one little enough to still be sung to, although I will whip it out for the others if I feel like they can use a little soothing,” Garner shares.

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“We’ve read, the lights are out, he’s folded up on me, there’s a favorite blanket, he’s on my lap and I rock him and sing ‘Rainbow Connection,’ ” explainsthe mother of three.

“It’s so soothing,” says Garner, who shares her three children with ex-husbandBen Affleck. “There’s no better feeling than a little kid in your lap while you rock him and sing to him.”

For more onJennifer Garner, pick up this week’s issue ofPEOPLE, on newsstands Friday.

source: people.com