"Gift from my darlings for 18"
Let's break it down:
* cadeau: gift
* de: from
* mes choupettes: my darlings (a term of endearment for young girls)
* pour: for
* 18: 18 (likely referring to an 18th birthday)
Therefore, the phrase suggests a gift from the speaker's daughters (or close young female friends) for an 18th birthday.