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Wireimage House / WireImage.com 1 / 4

Ashlee Simpson-Wentz is supporting her newly single sister Jessica on Twitter.

"Everyday you move me to be a better person. I love you..miss u so much," Ashlee wrote Tuesday to Jessica, who has been in Japan filming her new VH1 series, "The Price of Beauty." "You are a perfect friend and sis. Thank you."

Tony Romo dumped Jessica on the eve of her 29th birthday in July, causing her to cancel a Barbie and Ken-themed party. (Still, mom Tina said last week the family "still likes" him.)

"Les Miserables 'On My Own' -- can't sing this song without u ever. But it's my fav!" added Ashlee. The Broadway tune includes lyrics: "Pretending he's beside me/All alone, I walk with him till morning."

Jessica appreciates that her sis has her back.

"I could never imagine getting thru the day without the love we share. I feel so far away!! Just wanna have pillow talk," she posted on Twitter in response.

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